@inbook {1074,
	title = {Phylogenetic relatonships and the origin of social parasitism in Vespidae and and in Bombus and Psithyrus as revealed by enzyme genes},
	booktitle = { Teoksessa:  Howse, P.E. \& Clement, J.-L. (toim.), Biosystematics of social insects. Systematics Assoc. Spec. 19: 37-48.},
	year = {1981},
	author = {Pamilo, P. and Pekkarinen, A. and Varvio-Aho, S.-L.}
}
@inbook {1057,
	title = { Population genetics of the Formica group. {\textendash} Teoksessa: Eder, J. \& Rembold, H. (toim.), Chemistry and biology of social insects: 68-70. Verlag J. Peperny, M{\"u}nchen.},
	year = {1987},
	author = {Pamilo, P.}
}
