Faculty of Materials Science and Technology, Institute of Safety and Environmental Engineering, Slovak University of Technology in Bratislava, Botanická 49, 917 24 Trnava, Slovak Republic
Roman Chovanec
Faculty of Mining, Ecology, Technical University of Košice
Dana Rošková
Faculty of mechanical engineering, Department of environmental studies and information engineering, Technical University of Košice, Park Komenského 5, 041 87 Košice, Slovak Republic