Bojidarka Ivanova, Ph.D. received her M.Sc. degree in physical and theoretical chemistry in 1997 from Sofia University (St. Kl. Okhridski), Bulgaria. She earned her Ph.D. in analytical chemistry from Sofia University in 2001. Since 2003, Dr. Ivanova has been an associate professor in chemistry, holding the corresponding position at the Department of Analytical Chemistry at Sofia University. Tsonko Kolev, D.Sc. obtained his M.Sc. degree in chemistry in 1973 at Sofia University (St. Kl. Okhridski), Bulgaria, and his Ph.D. in organic chemistry in 1982 from the Institute of Organic Chemistry, Bulgarian Academy of Sciences. His current position is head of the Department of Organic Chemistry at Plovdiv University (P. Hilendarski), Bulgaria.