Period, color, and luminosity for Cepheid variablesDOI: info:10.5479/si.00810231.17.1v. 17Smithsonian Institution1–10
Gaposchkin, Cecilia Helena Payne. 1974. "Period, color, and luminosity for Cepheid variables." Smithsonian Contributions to Astrophysics, 17 1–10. https://doi.org/10.5479/si.00810231.17.1.