[1] Shvetsov MS: General geologic map of the European part of the USSR. Sheet 58. Northwest part of sheet. In: Trudy Vsesojuznogo geologorazvedochnogo ob’edinenia. Issue 83. Moscow – Leningrad: Gosnauchtekhizdat; 1932: 184 pp.

[2] Alekseev SK, Dudkovsky NI, Margolin VA, and Rogulenko AV: Fauna of the vertebrate of Kaluga region. Kaluga: Polytop; 2011: 190 pp.

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[5] Borkin LJ: Morphological abnormalities in natural populations of amphibians: what do we study and how do we measure? In: Vershinin VL, Dubois A, Henle K, Puky M, eds. Amphibian & Reptile Anomalies & Pathology. Yekaterinburg; 2014: 25-36 [in Russian with English summary].

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[8] Heyer WR, Donnelly MA, McDiarmid RW, Hayek LA, and Foster MS, eds. Measuring and monitoring biological diversity: standard methods for amphibians. Moscow: KMK Scientific press; 2003: 380 pp. [in Russian]

[9] Nekrasova OD: Classification of amphibian anomalies. Proc. of the Ukranian Herpetological Society 2008; 1; 55-58 [in Russian with English summary].

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[11] Zaks MM, Bystrakova NV, Ermakov OA, Titov SV: Molecular genetic and morphological characteristics of Marsh frogs (Pelophylax ridibundus) from the Penza region. In: Modern herpetology: problems and how to solve them: the first international conference of the young herpetologists of Russia and neighboring countries. St
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[12] Svinin AO: Distribution, kinds of population systems, and morphological variability of the water frogs of hybridic Pelophylax esculentus-complex in the northeast of their ranges: Candidate thesis. Kazan; 2016: 205 pp. [in Russian].

[13] Nekrasova OD: Some aspects of anomaly manifestation in amphibian coloration. In: Vershinin VL, Dubois A, Henle K, Puky M, eds. Amphibian & reptile anomalies & pathology. Yekaterinburg; 2014: 144-149 [in Russian with English summary].

[14] Dmitrieva TV, Korzhavyy AP, Chernova MV, Lapa NN: Degradation of phenolic compounds caused by freshwater symbiotic biocenosis. Izvestija Tulskogo gosudarstvennogo universiteta. Ser. Natural sciences 2008: 1: 239-245 [in Russian].

[15] Fayzulin AI, Chikhlyaev IV: Morphological anomalies of anurans (Anura, Amphibia) of the Middle Volga region. In: Actual problems of herpetology and toxinology. Issue 9. Tolyatti; 2006: 178-182 [in Russian].

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[17] Zamaletdinov RI: Materials on the occurrence morphological abnormalites in natural populations of anurans in Tatarstan Resbublic. In: Vershinin VL, Dubois A, Henle K, Puky M, eds. Amphibian & reptile anomalies & pathology. Yekaterinburg; 2014: 105- 111 [in Russian with English summary].

[18] Ermakov OA, Fayzulin AI, Zaks MM, Kaybeleva EI, Zaripova FF: Distribution of the “Western” and “Eastern” forms of Marsh Frog Pelophylax ridibundus s.l. in the Samara and Saratov regions (on data of analysis of mtDNA and nDNA). Proceedings of the Samara Scientific Center of the RAS. 2014; 16: 409-412 [in Russian].

[19] Ivanov AYu, Korzikov VA, Alekseev SK, Ermakov OA: Molecular and genetic characteristic of Marsh Frogs of Pelophylax ridibunduss.l. from upper Poochye. Modern problems of zoology, ecology and conservation. Materials of the readings and scientific conference devoted to the memory of Professor Andrey Grigoryevich
Bannikov and to the 100