Reference

V. S. Grebennikov, S. V. Grebennikov (1984): A new possible factor of the nest orientation in [aculeate] Hymenoptera; [Ru. Date: 26.VII.1984]. – In: VASIL'YEV, V. P. (ed.). The 9th Congress of the All-Union Entomological Society (Kiev, October 1984). Abstracts. Pt 1. Kiev (Naukova Dumka) – : 124 - 125.