1. a Geological , Geophysical and Space Science Research Group of the Hungarian Academy of Sciences , 1/C Pázmány P. sétány, H-1117 , Budapest
2. b Geological Institute of Hungary , 14 Stefánia út, H-1143 , Budapest
3. c Institute for Geochemical Research , Hungarian Academy of Sciences , 45 Budaörsi út, H-1112 , Budapest
4. d Institute of Nuclear Research , Hungarian Academy of Science , 18/c Bem tér, H-4026 , Debrecen