Apiculture Division, University of Warmia and Mazury in Olsztyn, Sloneczna 48, 10-710 Olsztyn, Poland
Jerzy Wilde
Apiculture Division, University of Warmia and Mazury in Olsztyn, Sloneczna 48, 10-710 Olsztyn, Poland
Tomasz Bąk
Department of Commodities Science and Animal Raw Material Processing, University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-719 Olsztyn, Poland