1. UMR-CNRS 6521, Université de Bretagne Occidentale, 6, Avenue
Victor Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
2. Institute of Chemistry, Faculty
of Natural Sciences and Mathematics, “Ss Cyril and Methodius” University, P.O. Box 162, 1000
Skopje, Republic of Macedonia
3. Faculty of Medical Sciences, University Goce Delčev, Štip, Republic
of Macedonia