@article {54,
	title = {Estimation of bumblebee densities (Bombus: Hymenoptera, Apidae)},
	journal = {Acta Entomologica Fennica},
	volume = {42},
	year = {1983},
	pages = {103-113},
	keywords = {Aculeata, Apidae, Bombus},
	author = {Ter{\"a}s, I.}
}
