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2. Genetic differentiation during the speciation process in Drosophila;Ayala;Evolution,1974
3. Is Rana esculenta lessonae Camerano a distinct species?;Berger;Ann. Zool. (Warszawa),1964
4. Biometrical studies on the population of green frogs from the environs of Poznan;Berger;Ann. Zool., Warszawa,,1966
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