Reference

A. E. Khumala (1991): Hymenopterous insects, included in the Red Data Book of the USSR, occurring in Karelia; p. 91. [Ru. Date: 7.VIII.1991]. – In: MOZOLEVSKAYA, E. G. (ed.). Reservation of Forest Ecosystems and Rational Utilisation of Forest Resources. The 2nd All-Union Scientific-Technical Conference. Ab-stracts. Pt 1. Moscow (Moscow Forestry Institute) – .