@inbook {911,
	title = { Sampling of different social categories of red wood ants (Formica str.) for biomonitoring. },
	booktitle = {Markert, B. (toim.), Sampling of environmental materials for trace analysis. VCH-Publisher, Weinheim, New York, Tokio, s. 338-358.},
	year = {1994},
	author = {Maavara, V. and Martin, A.J. and Oja, A. and Nuorteva, P.}
}
