Václav Gvoždík, David Jandzik, Petros Lymberakis, Daniel Jablonski & Jiří Moravec: Slow worm, Anguis fragilis (Reptilia: Anguidae) as a species complex: Genetic structure reveals deep divergences. Molecular Phylogenetics and Evolution, Volume 55, Issue 2, May 2010, Pages 460-472. DOI:10.1016/j.ympev.2010.01.007 (Engl. Abstract online)