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Panchromatic Hubble Andromeda Treasury XIII: The Cepheid period-luminosity relation in M31
R. Wagner-Kaiser, A. Sarajedini, J. J. Dalcanton, B. F. Williams and A. Dolphin Monthly Notices of the Royal Astronomical Society 451(1) 724 (2015) https://doi.org/10.1093/mnras/stv880
VI-BAND FOLLOW-UP OBSERVATIONS OF ULTRA-LONG-PERIOD CEPHEID CANDIDATES IN M31