Environmental Research Department, Faculty of Technology, Institute of Technology and Business in České Budějovice, Orkužní 517/10, 370 01 České Budějovice, Czech Republic
Jan Falkus
Department of Ferrous Metallurgy, Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza Av. 30, 30-059 Kraków, Poland