(Q22242030)

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

review article

2 references

19 November 2020

Autistic phenotypes and genetic testing: state-of-the-art for the clinical geneticist (English)

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

preventive health services

12 January 2020

main subject

autism

0 references

1 reference

PubMed

biomedical investigative technique

22 July 2019

1 reference

19 September 2019

1 reference

19 November 2020

1

C Lintas

C

Lintas

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

2

A M Persico

A M

Persico

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

language of work or name

English

0 references

publication date

26 August 2008

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

Journal of Medical Genetics

12 January 2020

1 January 2009

1 reference

19 November 2020

5 references

13 March 2019

22 July 2019

19 September 2019

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

19 November 2020

46

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

issue

1

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

page(s)

1-8

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

Creative Commons Attribution 2.0 Generic

12 January 2020

copyright license

4 references

13 March 2019

22 July 2019

19 September 2019

on focus list of Wikimedia project

19 November 2020

copyright status

copyrighted

0 references

ScienceSource

0 references

cites work

Evidence-based comprehensive treatments for early autism

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Structural variation of chromosomes in autism spectrum disorder

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Disruption of neurexin 1 associated with autism spectrum disorder

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Contribution of SHANK3 mutations to autism spectrum disorder

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

A neuroligin-3 mutation implicated in autism increases inhibitory synaptic transmission in mice

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Strong association of de novo copy number mutations with autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Neurexin-neuroligin signaling in synapse development

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mutations in the gene encoding the synaptic scaffolding protein SHANK3 are associated with autism spectrum disorders

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

High frequency of neurexin 1beta signal peptide structural variants in patients with autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Clinical and molecular cytogenetic characterisation of a newly recognised microdeletion syndrome involving 2p15-16.1

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Novel splice isoforms for NLGN3 and NLGN4 with possible implications in autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Homozygous HOXA1 mutations disrupt human brainstem, inner ear, cardiovascular and cognitive development

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Subset of individuals with autism spectrum disorders and extreme macrocephaly associated with germline PTEN tumour suppressor gene mutations

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

The Arg451Cys-neuroligin-3 mutation associated with autism reveals a defect in protein processing

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Disorder-associated mutations lead to functional inactivation of neuroligins

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

X-linked mental retardation and autism are associated with a mutation in the NLGN4 gene, a member of the neuroligin family

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mutations of the X-linked genes encoding neuroligins NLGN3 and NLGN4 are associated with autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Autism: highly heritable but not inherited

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Searching for ways out of the autism maze: genetic, epigenetic and environmental clues

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Genetic counseling and ethical issues for autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Rett syndrome is caused by mutations in X-linked MECP2, encoding methyl-CpG-binding protein 2

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Broader autism phenotype: evidence from a family history study of multiple-incidence autism families

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mapping autism risk loci using genetic linkage and chromosomal rearrangements

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Familial deletion within NLGN4 associated with autism and Tourette syndrome

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

No evidence for involvement of genetic variants in the X-linked neuroligin genes NLGN3 and NLGN4X in probands with autism spectrum disorder on high functioning level

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Association between microdeletion and microduplication at 16p11.2 and autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

The story of Rett syndrome: from clinic to neurobiology

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Pten regulates neuronal arborization and social interaction in mice

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Absence of coding mutations in the X-linked genes neuroligin 3 and neuroligin 4 in individuals with autism from the IMGSAC collection

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Incidence of autism spectrum disorders: Changes over time and their meaning*

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Autism associated with conditions characterized by developmental errors in early embryogenesis: a mini review

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Analysis of the neuroligin 3 and 4 genes in autism and other neuropsychiatric patients

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

NLGN3/NLGN4 gene mutations are not responsible for autism in the Quebec population

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mutation screening of X-chromosomal neuroligin genes: no mutations in 196 autism probands

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

19 March 2017

The genetics of autism

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Association between the HOXA1 A218G polymorphism and increased head circumference in patients with autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

PTEN: one gene, many syndromes

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Identification of MeCP2 mutations in a series of females with autistic disorder

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

19 March 2017

The prevalence of autism

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mutation analysis of the coding sequence of the MECP2 gene in infantile autism

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Neuroligin 1: a splice site-specific ligand for beta-neurexins

19 March 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Neurexin 1alpha structural variants associated with autism

7 April 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Novel submicroscopic chromosomal abnormalities detected in autism spectrum disorder

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Analysis of X chromosome inactivation in autism spectrum disorders

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Recurrent 16p11.2 microdeletions in autism

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Prevention of colorectal cancer in high-risk populations: the increasing role for endoscopy and chemoprevention in FAP and HNPCC.

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Clinical characterization of the HOXA1 syndrome BSAS variant

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Management updates for women with a BRCA1 or BRCA2 mutation

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Genetic testing in autism: how much is enough?

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mutation screening of the PTEN gene in patients with autism spectrum disorders and macrocephaly

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

MeCP2 gene mutation analysis in autistic boys with developmental regression

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Array-based comparative genomic hybridisation identifies high frequency of cryptic chromosomal rearrangements in patients with syndromic autism spectrum disorders

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

The developmental neurobiology of autism spectrum disorder.

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Mutation analysis of methyl-CpG binding protein family genes in autistic patients

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Neuroanatomic observations of the brain in autism: a review and future directions

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Brain development in autism: early overgrowth followed by premature arrest of growth

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Absence of MeCP2 mutations in patients from the South Carolina autism project

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

PTEN mutation in a family with Cowden syndrome and autism

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

The epidemiology of autism: a review.

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Head circumference is an independent clinical finding associated with autism

12 September 2017

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Spectrum of mutations in the MECP2 gene in patients with infantile autism and Rett syndrome

30 May 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Microcephaly and macrocephaly in autism

30 May 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Macrocephaly in children and adults with autism.

30 May 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Head circumference in autism and other pervasive developmental disorders.

30 May 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

The diagnosis of autism in a female: could it be Rett syndrome?

30 May 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Clinical, morphological, and biochemical correlates of head circumference in autism.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

MECP2 coding sequence and 3'UTR variation in 172 unrelated autistic patients.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Increasing knowledge of PTEN germline mutations: Two additional patients with autism and macrocephaly.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Sequence variants within exon 1 of MECP2 occur in females with mental retardation.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

HOXA1 gene variants influence head growth rates in humans.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

The Arg473Cys-neuroligin-1 mutation modulates NMDA mediated synaptic transmission and receptor distribution in hippocampal neurons

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Analysis of four neuroligin genes as candidates for autism.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

MECP2 structural and 3'-UTR variants in schizophrenia, autism and other psychiatric diseases: a possible association with autism

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Study of MECP2 gene in Rett syndrome variants and autistic girls.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

No mutations in the coding region of the Rett syndrome gene MECP2 in 59 autistic patients.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

Chromosomal disorders and autism.

29 November 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

29 November 2018

Autism and macrocephaly.

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2603481

29 November 2018

Identifiers

DOI

10.1136/JMG.2008.060871

2 references

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

1 reference

2 references

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:18728070%20AND%20SRC:MED&resulttype=core&format=json

12 January 2020

PubMed publication ID

18728070

2 references