[1]
Fitch, Walter S (szerk.):
Multiple periodic variable stars 1. Proceedings of the International Astronomical Union Colloquium No. 29. Held at Budapest 1-5 September 1975
Budapest, 1976
[2]
Fitch, Walter S (szerk.):
Multiple periodic variable stars 2. Proceedings of the International Astronomical Union Colloquium No. 29. Held at Budapest 1-5 September 1975
Budapest, 1976