参考文献1. Leavitt， H. S.， & Pickering， E. C. (1912). “Periods of 25 Variable Stars in the Small Magellanic Cloud.” Harvard College Observatory Circular， 173， 1-3.2. Freedman， W. L.， & Madore， B. F. (2010). “The Hubble Constant.” Annual Review of Astronomy and Astrophysics， 48， 673-710.3. Ferrarese， L.， et al. (2000). “A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch.” The Astrophysical Journal Supplement Series， 128， 431-459.4. Riess， A. G.， et al. (2016). “A 2.4% Determination of the Local Value of the Hubble Constant.” The Astrophysical Journal， 826， 56.5. Beaton， R. L.， et al. (2016). “The Carnegie-Chicago Hubble Program. I. An Independent Approach to the Extragalactic Distance Scale Using only Population II Distance Indicators.” The Astrophysical Journal， 832， 210.Madore， B. F.， & Freedman， W. L. (1991). “The Cepheid Distance Scale.” Publications of the Astronomical Society of the Pacific， 103， 933-957.

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