Reference

Alexey L. Ershov (2000): Pollinators of lucerne in the Middle Ural region; [Ru; 2 tabs. Date: 22.XII.2000]. – BOGDANOV, I. I. (ed.). Natural History Sciences and Ecology. Annual. An Inter-College Collection of Scientific Papers. No. 5. Omsk (Omsk State Pedagogical Institute) – : 128 - 130.