A comparative analysis of female genitalia of seven Old World snakes using a recently proposed technique by Kostadin Andonov, Angel Dyugmedzhiev, Borislav Naumov, Nikolay Todorov, Vladislav Vergilov

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Behavioral effects of long-chained ketones in Vipera ammodytes: an experimental approach by Kostadin Andonov, Angel Dyugmedzhiev, Simeon Lukanov, Emiliya Vacheva, Georgi Popgeorgiev, Daniela Nedeltcheva-Antonova, Borislav Naumov

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Key areas for the conservation of endangered reptile species in the Kresna Gorge, south-western Bulgaria by Georgi Popgeorgiev, Angel Dyugmedzhiev, Simeon Lukanov, Emiliya Vacheva, Miroslav Slavchev, Kostadin Andonov, Vladislav Vergilov, Deyan Duhalov, Georgi Krastev, Andrei Stojanov, Nikolay Tzankov, Dimitar Plachiyski, Yurii V. Kornilev, Borislav Naumov

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