Kryvoltsevych, Anastasia, et al. “Anomalies in Marsh Frogs (Pelophylax Ridibundus) and Hybrid Waterfrogs (P. Esculentus) (Anura: Ranidae) from Two Ponds in the Kharkiv Region of Ukraine”. Reptiles & Amphibians, vol. 29, no. 1, Mar. 2022, pp. 204-9, https://doi.org/10.17161/randa.v29i1.16446.