Institution: | 1. Ond?ejov Observatory, 251 65, Ond?ejov, Czechoslovakia 2. Brandon University, R7A 6A9, Brandon, Manitoba, Canada 3. Observatoire de Paris-Meudon, 92190, Meudon, France 4. National Astronomical Observatory Rozhen, Bulgaria 5. D. Dunlap Observatory, L4C 4Y6, Richmond Hill, Ont., Canada
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