1. School of Mineral Resources Engineering, Technical University of Crete (TUC), 73100 Chania, Greece
2. Institut National de l’Environnement Industriel et des Risques (INERIS), 54042 Nancy, France
3. Vyzkumny Ustav pro Hnede Uhli (VUHU), 2830 tř. Budovatelů, Czech Republic
4. Faculty of Mining and Geology, VSB Technical University Ostrava, 17 Listopadu 2172-15, 70800 Ostrava, Czech Republic