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P. Petkova
Shumen University “Konstantin Preslavsky”, 115 Universitetskastreet, 9712 Shumen, Bulgaria
P. Vasilev
Shumen University “Konstantin Preslavsky”, 115 Universitetskastreet, 9712 Shumen, Bulgaria
B. Bedzhev
Shumen University “Konstantin Preslavsky”, 115 Universitetskastreet, 9712 Shumen, Bulgaria
R. Belcheva
Foreign Language High School “Nicola Vaptsarov”, 36 Madara boulevard, 9700 Shumen, Bulgaria
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Chemistry, other, Geosciences, Geography, Life Sciences, Physics