1. Laboratory on Structure and Properties of Polymers, Department of Pharmaceutical and Applied Organic Chemistry, Faculty of Chemistry and Pharmacy Sofia University ‘St. Kl. Ohridski’ Sofia Bulgaria
2. Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences Sofia Bulgaria
3. Department of Pathology, Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences Sofia Bulgaria