Authors
Asya Dragoeva
University of Shumen, Faculty of Natural Sciences, Department of Biology, Shumen, Bulgaria
Zheni Stoyanova
University of Shumen, Faculty of Natural Sciences, Department of Biology, Shumen, Bulgaria
Martin Marinov
University of Shumen, Faculty of Natural Sciences, Department of Biology, Shumen, Bulgaria
Vanya Koleva
University of Shumen, Faculty of Natural Sciences, Department of Biology, Shumen, Bulgaria