Reference

E. K. Grinfel'd (1975): The flower constancy in insects. [Ru, en; 5 tabs., 10 refs. Date: 12.IX.1975]. – Vestnik Leningrad. Univ. (Leningrad), 1975 (15; Ser. Biol., no. 3) – 1975 (15;): 23 - 33.