Key points are not available for this paper at this time.
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.
Welch et al. (Sun,) studied this question.