@article {1138,
	title = { Food niche analyses of bumblebees: a comparison of three data collecting methods},
	journal = {Oikos},
	volume = {36},
	year = {1981},
	pages = {12-16},
	author = {Ranta, E. and Lundberg, H.}
}
@article {1137,
	title = {Resource utilization by bumblebee queens, workers and males in a subarctic area},
	journal = {Holarctic Ecology},
	volume = {4},
	year = {1981},
	pages = {145-154},
	author = {Ranta, E. and Lundberg, H.}
}
@article {1136,
	title = {Resource partitioning in bumblebees: the significance of differences in proboscis length},
	journal = {Oikos},
	volume = {35},
	year = {1980},
	pages = {298-302},
	author = {Ranta, E. and Lundberg, H.}
}
@article {908,
	title = {Habitat and food utilization in subarctic bumblebee community},
	journal = {Oikos},
	volume = {35},
	year = {1980},
	pages = {303-310},
	author = {Lundberg, H. and Ranta, E.}
}
@article {52,
	title = {Phenological spread in flowering of bumblebee-pollinated plants},
	journal = {Annales Botanici Fennici},
	year = {1981},
	pages = {229-236},
	keywords = {pdf},
	author = {Ranta, E. and Ter{\"a}s, I. and Lundberg, H.}
}
@article {50,
	title = {Patterns of resource utilization in two Fennoscandian bumblebee communities},
	journal = {Oikos},
	volume = {36},
	year = {1981},
	pages = {1-11},
	keywords = {Aculeata, Bombus},
	url = {http://www.jstor.org/stable/3544371?seq=1$\#$page_scan_tab_contents},
	author = {Ranta, E. and Lundberg, H. and Ter{\"a}s, I.}
}
