@article {62,
	title = {Suomen kimalaisista ja loiskimalaisista (On Finnish bumblebees and cuckoo bumblebees (Apidae))},
	journal = {Luonnon Tutkija},
	volume = {81},
	year = {1977},
	pages = {1-24},
	keywords = {Aculeata, Apidae, Bombus, pdf},
	author = {Pekkarinen, A. and Ter{\"a}s, I.}
}
@article {51,
	title = {Distribution of bumble-bees (Hymenoptera, Apidae: Bombus and Psithyrus) in Eastern Fennoscandia.},
	journal = {Notulae Entomologicae},
	volume = {61},
	year = {1981},
	pages = {71-89},
	keywords = {Aculeata, Apidae, Bombus, pdf},
	author = {Pekkarinen, A. and Ter{\"a}s, I. and Viramo, J. and Paatela, J.}
}
