@article {69,
	title = { Kukka ja kimalainen {\textendash} optimaalista ravinnonhankintaa? (Do bumblebees for-age optimally?).},
	journal = {Luonnon Tutkija},
	volume = {89},
	year = {1985},
	pages = {4-11},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Ter{\"a}s, I.}
}
@article {56,
	title = {Flower visits of bumblebees (Bombus: Hymenoptera, Apidae) during one day in northeastern Finland.},
	journal = {Notulae Entomologicae},
	volume = {65},
	year = {1985},
	pages = {129-135},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Ter{\"a}s, I.}
}
@article {55,
	title = { Food plants and flower visits of bumblebees (Bombus: Hymenoptera, Apidae) in southern Finland},
	journal = {Acta Zoologica Fennica},
	volume = {179},
	year = {1985},
	pages = {1-120},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Ter{\"a}s, I.}
}
