1. Institut für Angewandte Geowissenschaften, Technische Universität, Darmstadt Schnittspahnstra ße 9, D-64287 Darmstadt, Germany
2. Michal Nemčok Energy and Geoscience Institute at University of Utah, 423 Wakara Way, Suite 300, Salt Lake City, UT 84108, USA
3. Energy and Geoscience Laboratory at Geological Institute of Slovak Academy of Sciences, Dúbravská cesta 9, SK-840 05 Bratislava, Slovakia