Reference

V. S. Grebennikov (1983): Ground Bees Pollinating Alfalfa in the Novosibirsk and Omsk Provinces. Methodical Recommendations. — 11 pp.; [Ru; 6 figs., 3 refs. Date: 22.VII.1983]. – Novosibirsk (Siberian Branch of the V. I. LENIN All-Union Academy of Agricultural Sciences) – .