[1]
P. Pamilo, J. Tengö, P. Rasmont, K. Pirhonen, A. Pekkarinen, and E. Kaarnama, “Pheromonal and enzyme genetic characteristics of the <i>Bombus lucorum</i> species complex in northern Europe”, Entomol. Fennica, vol. 7, no. 4, pp. 187–194, Dec. 1996.