1. Beerli, P., Genetic Isolation and Calibration of an Average Protein Clock in Western Palearctic Water Frogs of the Aegean Region, Ph. D. Dissertation, Universitet Zurich, 1994.
2. Spolsky, C. and Uzzel, T., Natural Interspecies Transfer of Mitochondrial DNA in Amphibians, Proc. Nat. Acad. Sci. USA, 1984, vol. 81, no. 18, pp. 5802–5805.
3. Spolsky, C. and Uzzell, T., Evolutionary History of the Hybridogenetic Hybrid of Rana esculentus as Deduced from mtDNA Analyses, Mol. Biol. Evol., 1986, vol. 3, no. 1, pp. 44–56.
4. Vorburger, C. and Reyer, H.-U., A Genetic Mechanism of Species Replacement in European Water Frogs?, Cons. Genet., 2003, vol. 4, no. 2, pp. 141–155.
5. Plötner, J., Uzzell, T., Beerli, P., et al., Widespread Unidirectional Transfer of Mitochondrial DNA: A Case in Western Palaearctic Water Frogs, J. Evol. Biol., 2008, no. 21, pp. 668–681.