参考文献1. Feast， M. W.， & Catchpole， R. M. (1997). “The Cepheid Period-Luminosity Zero-point from HIPPARCOS Trigonometrical Parallaxes.” Monthly Notices of the Royal Astronomical Society， 286， L1-L5.2. Madore， B. F.， & Freedman， W. L. (1998). “Concerning the Slope of the Cepheid Period-Luminosity Relation.” The Astrophysical Journal， 492， 110-115.3. Udalski， A.， et al. (1999). “The Optical Gravitational Lensing Experiment. Cepheids in the Magellanic Clouds.” Acta Astronomica， 49， 201-221.4. Parodi， B. R.， et al. (2000). “The Effect of Metallicity on Cepheid-based Distances.” The Astrophysical Journal Supplement Series， 540， 634-651.5. Freedman， W. L.， et al. (2001). “Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant.” The Astrophysical Journal， 553， 47-72.Gibson， B. K.， et al. (2000). “The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVI. The Calibration of Population II Secondary Distance Indicators and the Value of the Hubble Constant.” The Astrophysical Journal， 529， 723-744.

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