Riess, Adam G.; Li, Weidong; Stetson, Peter B.; Filippenko, Alexei V.; et al. (2005). "Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Redetermination of the Hubble Constant". Astrophysical Journal. 627 (2): 579–607. arXiv:astro-ph/0503159. Bibcode:2005ApJ...627..579R. doi:10.1086/430497.
Riess, Adam G.; Li, Weidong; Stetson, Peter B.; Filippenko, Alexei V.; et al. (2005). "Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Redetermination of the Hubble Constant". Astrophysical Journal. 627 (2): 579–607. arXiv:astro-ph/0503159. Bibcode:2005ApJ...627..579R. doi:10.1086/430497.
Riess, Adam G.; Li, Weidong; Stetson, Peter B.; Filippenko, Alexei V.; et al. (2005). "Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Redetermination of the Hubble Constant". Astrophysical Journal. 627 (2): 579–607. arXiv:astro-ph/0503159. Bibcode:2005ApJ...627..579R. doi:10.1086/430497.