1. Consultant Geochemist, Budapest, Hungary
2. Department of Physical and Applied Geology, Eötvös Loránd University, Budapest, Hungary
3. Geological Survey of Austria, Vienna, Austria
4. Department of Mineralogy and Geochemistry, University of Szeged, Szeged, Hungary
5. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Science, Hungarian Academy of Sciences, Budapest, Hungary
6. MTA Institute for Nuclear Research, Debrecen, Hungary