Authors
Mariola Kądziołka-Gaweł
mariola.kadziolka-gawel@us.edu.pl
Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007, Katowice, Poland
Danuta Smolka-Danielowska
Faculty of Earth Sciences, University of Silesia, 60 Będzińska Str., 41-200, Sosnowiec, Poland