Angelova, Violina, Prof. Dr.

Department of Chemistry, Agricultural University, Plovdiv, Bulgaria

vileriz@yahoo.com

Djingova, rumyana, Prof. Dr.

Faculty of Chemistry, University of Sofia, Sofia, Bulgaria

          RDjingova@chem.uni-sofia.bg



Petranka, Petrova, PhD

South-West University “Neofit Rilski”, Faculty of Mathematics and Natural Sciences, Department of Chemistry, Blagoevgrad, Bulgaria

petya_dukova@yahoo.com