@conference {1051,
	title = {Effects of environmental splitting by urbanization on the species of the Formica rufa group. {\textendash} Proc. II Internat. Symposium, IUSSI, Warsaw: 69-78.},
	year = {1976},
	author = {Wuorenrinne, H. and Veps{\"a}l{\"a}inen, K.}
}
