Reference

V. S. Grebennikov (1971): On measures for the reservation and utilisation of bumble bees as important pollinators; [Ru. Date: 15.IX.1971]. – In: PETEL, V. A. (ed.). Rational Utilisation and Conservation of Animate Nature in Siberia. The Scientific Conference. Abstracts. Tomsk (Tomsk State University) – : 109 - 110.