Reference

N. I. Kulikov, V. P. Naumkin, N. I. Velkova (2000): Insect pollinators on white mustard plantations; [Ru; 3 tabs. Date: [31.XII].2000]. – In: NAUMKIN, V. P. (ed.). A Collection of Scientific Papers on Apiculture. No. 4. Orel (Orel State Agricultural University) – : 97 - 100.