LAJTNER, Jasna et al. Comparative shell morphology of the zebra mussel, Dreissena polymorpha in the Drava river (Croatia). In Biologia. Section A. Section B. Section C, Botany. Zoology. Cellular and molecular biology. ISSN 0006-3088. ISSN 1335-6372. ISSN 1335-6380. ISSN 1335-6399. Bratislava : Slovak Academic Press, 2004, vol. 59, no. 5, p. 595-600.