1. LUKOIL Neftohim Burgas, 8104 Burgas, Bulgaria
2. Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Georgi Bonchev 105, 1113 Sofia, Bulgaria
3. Intelligent Systems Laboratory, University Prof. Dr. Assen Zlatarov, Professor Yakimov 1 St., 8010 Burgas, Bulgaria
4. Department of Mathematics, University of Chemical Technology and Metallurgy, Kliment Ohridski 8, 1756 Sofia, Bulgaria
5. Department of Chemical Engineering, The University of Manchester, Oxford Rd, Manchester M13 9PL, UK