American Astronomical Society, Astrophysical Journal Supplement, (54), p. 547, 1984
DOI: 10.1086/190943
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New JHK photometry is presented for 69 galactic classical Cepheids. Full phase coverage observations for 23 of these stars is used to determine the relationship between UBV and JHK amplitudes. A procedure for recovering mean magnitudes from single-phase observations of known Cepheids is outlined. These relationships are necessary for the determination of the infrared period-luminosity relations.