1. Institute of GeotechnicsSlovak Academy of Sciences Watsonova 45 04001 Košice Slovakia
2. GEOtest a.s., Šmahova 1244/112 62700 Brno Czech Republic
3. Jozef Stefan Institute Jamova cesta 39 S1‐1000 Ljublana Slovenia
4. Institute of PhysicsSlovak Academy of Sciences Dúbravská cesta 9 845 11 Bratislava Slovakia
5. Institute of Mineral and Waste Processing, Waste Disposal and GeomechanicsUniversity of Technology Walther‐Nernst‐Strasse 9 38678 Clausthal Germany
6. Institute of Earth Resources, Faculty of Mining, Ecology, Process Control and GeotechnologiesTechnical University in Košice Letná 9 04001 Košice Slovakia
7. Nihon Seiko Co., Ltd. 1198, Yoshii, Yabu‐shi Hyogo 667‐1111 Japan
8. Sumy State University Rymskogo‐Korsakova 2 40007 Sumy Ukraine