Reference

V. N. Gramma, M. A. Filatov, B. M. Yakushenko (1982): Some problems in the reservation, increase of abundance, and propagation of wild bees in the north-eastern Ukraine; [Ru; 4 refs. Date: 23.VI. 1982]. – In: GREBENNIKOV, V. S. (ed.). Insect Pollinators of Agricultural Plants. A Col-lection of Scientific Papers. Novosibirsk (Siberian Branch of the V. I. LENIN All-Union Academy of Agricultural Sciences) – : 73 - 76.