Full Length Research Paper
Authors
Asya Pencheva Dragoeva
Faculty of Natural Sciences, University of Shumen, Shumen, Bulgaria
Vanya Petrova Koleva
Faculty of Natural Sciences, University of Shumen, Shumen, Bulgaria
Zheni Dimitrova Nanova
Faculty of Natural Sciences, University of Shumen, Shumen, Bulgaria
Teodora Veselinova Koynova
Faculty of Natural Sciences, University of Shumen, Shumen, Bulgaria
Pavlina Kalcheva Jordanova
Faculty of Mathematics and Computer Science
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