1. Czech Geological Survey, Prague, Czech Republic
2. Institute of Petrology and Structural Geology, Charles University, Prague, Czech Republic
3. Faculty of Science, Institute of Engineering Geology, Hydrogeology and Applied Geophysics, Charles University, Prague, Czech Republic
4. Institute of Rock Structure and Mechanics, Czech Academy of Sciences, Prague, Czech Republic
5. Department of Natural Sciences, University of Houston-Downtown, Houston, TX, USA