@article {59,
	title = { Zoogeography of Bombus and Psithyrus in north-western Europe (Hymenoptera, Apidae).},
	journal = {Annales Zoologici Fennici},
	volume = {30},
	year = {1993},
	pages = {187-208},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Pekkarinen, A. and Ter{\"a}s, I.}
}
