Reference

N. N. Blagoveshchenskaya (1972): The increase of entomophilous plant productivity by using colonies of solitary bees (Hymenoptera, Apoidea); [En. Date: 8.VI.1972]. – In: RAFES, P. M. (ed.). The 13th International Entomological Congress (Moscow, 2-9 August 1968). Proceedings. Vol. 3. Leningrad (Nauka) – : 293 - 294.