1. Faculty of Economics, Technical Univ. of Liberec, Liberec 461 17, Czech Republic (corresponding author). ORCID: .
2. Professor, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical Univ. of Liberec, Liberec 461 17, Czech Republic.
3. Professor, r3 Environmental Technology Ltd., 37 St. Peters Ave., Reading RG4 7DH, UK. ORCID:
4. Faculty of Economics, Technical Univ. of Liberec, Liberec, 461 17, Czech Republic. ORCID:
5. Dept. of Water Protection, Central Mining Institute, Katowice 40-166, Poland. ORCID: