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Vanya Vasileva
University of Shumen Bishop Konstantin Preslavski, Faculty of Natural Sciences Shumen, Bulgaria
Dora Kabakchieva
University of Shumen Bishop Konstantin Preslavski, Faculty of Natural Sciences Shumen, Bulgaria
Sevdzhan Sabrieva
University of Shumen Bishop Konstantin Preslavski, Department for Information Qualification and Lifelong LearningShumen, Bulgaria
Dimitar Vladev
University of Shumen Bishop Konstantin Preslavski, Faculty of Natural Sciences Shumen, Bulgaria
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Chemistry, other, Geosciences, Geography, Life Sciences, Physics