Reference

N. D. Dobrynin (1998): Pollinators of Lucerne in the Central Chernozem Zone: Ecological Basis of Reservation, Management, and Utilisation. — 43 pp.; [Ru]. Non visum. – Dissertation of the Degree of Doctor of Bio-logical Sciences. Moscow (A. N. SEVERTSOV Institute of Problems in Ecology and Evolution, Rus-sian Academy of Sciences) – .