@article {61,
	title = {Bumblebee visits to different colour morphs of Lu-pinus polyphyllus},
	journal = {Entomologica Fennica},
	volume = {6},
	year = {1995},
	pages = {139-151},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Pohtio, I. and Ter{\"a}s, I.}
}
@inbook {60,
	title = {Polymorphic melanism of bumblebees in Finland and neighbouring areas (Hymenoptera: Apidae).},
	booktitle = { Changes in Fauna of Wild Bees in Europe},
	year = {1995},
	pages = {37-44},
	publisher = { Pedagogical Univer-sity, Bydgoszcz, Poland.},
	organization = { Pedagogical Univer-sity, Bydgoszcz, Poland.},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Pekkarinen, A. and Ter{\"a}s, I.}
}
