1. Morphology of F1 generation of green frogs different combinations;Berger;Acta Zool. Cracoviensia,1968
2. On the origin of genetic systems in European water frog hybrids;Berger;Zool. Pol.,1988a
3. Principles of studies of European water frogs;Berger;Acta Zool. Cracoy.,1988b
4. An all-hybrid water frog population existing in agro-cenoses of central Poland (Amphibia, Salientia, Ranidae);Berger;Proc. Acad. Nat. Sci. Philadelphia,1989
5. Ploidy of progeny from different egg size classes of Rana escluentza L;Berger;Folia Biol. Kraköw,1978