1. LUKOIL Neftohim Burgas, 8104 Burgas, Bulgaria
2. Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Academic Georgi Bonchev 105, 1113 Sofia, Bulgaria
3. University Prof. Dr. Assen Zlatarov, Professor Yakimov 1, 8010 Burgas, Bulgaria
4. Grace CIS, Brestskaya str. 33, building 2, Moscow 125047, Russian Federation
5. Grace GmbH, In der Hollerhecke 1, 67547 Worms, Germany
6. University of Chemical Technology and Metallurgy, Kliment Ohridski 8, 1756 Sofia, Bulgaria