TY - `BOOK` AU - Geyer, U. TI - The zero-point of the period-luminosity-relation of Cepheids PB - Astronom. Rechen-Institut CY - Heidelberg PY - 1970 LA - eng SE - S. 116-126 T2 - Mitteilungen / Astronomisches Recheninstitut in Heidelberg M1 - 23 N1 - Aus: Astronomy and astrophysics. 5. 1970 CN - 71 S 63 AN - UBHD-2134584 ER -