Authors
Darina Bachvarova
Department of Biology, Faculty of Natural Science, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
Aleksandar Doichinov
Department of Biology, Faculty of Natural Science, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
Rayme Abdulova
Department of Biology, Faculty of Natural Science, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria