(Q26940438)
Statements
1 reference
20 September 2016
1833
1 reference
20 September 2016
Johan Hendrik de Sitter, (Dutch)
1 reference
1 reference
20 September 2016
1 reference
1 reference
1 reference
1 reference
20 September 2016
1992.0365
1 reference
20 September 2016