Institution: | (1) Ondejov Observatory, 251 65 Ondejov, 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 |