1. Isotope Climatology and Environmental Research Centre (ICER) Institute for Nuclear Research (ATOMKI) Debrecen Hungary
2. Doctoral School of Physics University of Debrecen Debrecen Hungary
3. Department of Earth Sciences Royal Holloway University of London Egham UK
4. British Antarctic Survey Natural Environment Research Council Cambridge UK
5. Research Centre for Astronomy and Earth Sciences Geodetic and Geophysical Institute Sopron Hungary
6. Department of Geosciences University of Arizona Tucson AZ USA
7. University of Arizona AMS Laboratory Tucson AZ USA