@article {741,
	title = { Role of organic and conventional field boundaries on boreal bumblebees and butterflies.},
	journal = {Agriculture, Ecosystems and Environment},
	volume = {124},
	year = {2008},
	pages = {155-159.},
	author = {Ekroos, J. and Piha, M. and Tiainen, J.}
}
@article {737,
	title = {Habitat quality of field margins in a Finnish farmland area for bumblebees (Hymenoptera: Bombus and Psithyrus).},
	journal = {Agriculture, Ecosystems and Environment},
	volume = {89},
	year = {2002},
	pages = {53-68},
	author = {B{\"a}ckman, J.-P. C. and Tiainen, J.}
}
