1. New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic
2. Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 135, 165 02, Prague 6, Czech Republic
3. Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 165 00, Praha 6, Czech Republic