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Nancy Remage Evans, Howard E. Bond, Gail H. Schaefer, Brian D. Mason, Evan Tingle, Margarita Karovska et Ignazio Pillitteri, « Hubble Space Telescopesnapshot Survey for Resolved Companions of Galactic Cepheids », The Astronomical Journal, vol. 151, no 5, , p. 129 (DOI10.3847/0004-6256/151/5/129, Bibcode2016AJ....151..129E, arXiv1603.02224)
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P. Klagyivik et L. Szabados, « Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes », Astronomy and Astrophysics, vol. 504, no 3, , p. 959 (DOI10.1051/0004-6361/200811464, Bibcode2009A&A...504..959K, arXiv0908.3561)
Nancy Remage Evans, Howard E. Bond, Gail H. Schaefer, Brian D. Mason, Evan Tingle, Margarita Karovska et Ignazio Pillitteri, « Hubble Space Telescopesnapshot Survey for Resolved Companions of Galactic Cepheids », The Astronomical Journal, vol. 151, no 5, , p. 129 (DOI10.3847/0004-6256/151/5/129, Bibcode2016AJ....151..129E, arXiv1603.02224)