Authors
Hasan H. Hasanov
Department of Chemistry, Faculty of Natural Sciences, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
Ivaylo K. Ivanov
Department of Chemistry, Faculty of Natural Sciences, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
Valerij Ch. Christov
Department of Chemistry, Faculty of Natural Sciences, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria