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G. Benedict, Fritz; McArthur, Barbara E.; Feast, Michael W.; Barnes, Thomas G.; Harrison, Thomas E.; Patterson, Richard J.; Menzies, John W.; Bean, Jacob L.; Freedman, Wendy L.: Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations. In: the Astronomical Journal. 133. Jahrgang, Nr.4, 2007, doi:10.1086/511980, bibcode:2007AJ....133.1810B.