Authors
P. Vasilev
Shumen University “Konstantin Preslavsky”, Shumen, Bulgaria
M. Mustafa
Department of Chemistry, Balıkesir University, Turkey
I. Parushev
Shumen University “Konstantin Preslavsky”, Shumen, Bulgaria
© 2018 P. Petkova, P. Vasilev, Gulsah Celik Gul, M. Mustafa, I. Parushev, published by Konstantin Preslavski University of Shumen
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.