Authors
Nikolay Natchev
Faculty of Natural Science, Shumen University, Shumen, Bulgaria
Department of Integrative Zoology, Vienna University, Vienna, Austria
Zahari Petkov
Historical Museum Varna, Section Nature, Varna, Bulgaria
Georgi Dashev
Faculty of Natural Science, Shumen University, Shumen, Bulgaria
Ivanka Atanasova
Faculty of Natural Science, Shumen University, Shumen, Bulgaria
Nesho Chipev
Faculty of Natural Science, Shumen University, Shumen, Bulgaria