@inbook {1221,
	title = {The taxonomy oft he Formica rufa group: Chaos before order},
	booktitle = {Teoksessa:  Howse, P.E. \& Clement, J.-L. (toim.), Biosystematics of social insects. Systematics Assoc. Spec. 19: 27-36.},
	year = {1981},
	author = {Veps{\"a}l{\"a}inen, K. and Pisarski, B.}
}
@article {1175,
	title = {Distribuzione, densit{\'a} delle colonie ed importanza ecologica delle formiche del gruppo Formica rufa in Finlandia.},
	journal = { Collana Verde (Roma)},
	volume = {59},
	year = {1981},
	pages = {237-259},
	author = {Rosengren, R. and Veps{\"a}l{\"a}inen, K. and Wuorenrinne, H.}
}
@article {1140,
	title = {Why are there so many species? Spatio-temporal heterogeneity and northern bumblebee communities},
	journal = {Oikos},
	volume = {36},
	year = {1981},
	pages = {28-34},
	author = {Ranta, E. and Veps{\"a}l{\"a}inen, K.}
}
