Cepheid calibration of the peak brightness of type Ia supernovae: calibration of SN 1990N in NGC 4639 averaged with six earlier type Ia supernova calibrations to give H0 directly
Cepheid calibration of the peak brightness of type Ia supernovae: calibration of SN 1990N in NGC 4639 averaged with six earlier type Ia supernova calibrations to give H0 directly(English)