1. Dendrolab.ch, Institute of Geological Sciences, University of Bern; Bern Switzerland
2. Institute for Environmental Sciences, University of Geneva; Geneva Switzerland
3. Institute of Nature Conservation, Polish Academy of Sciences; Kraków Poland
4. Faculty of Earth Sciences; University of Silesia; Sosnowiec Poland
5. Department of Environmental Engineering, Geomatics and Energetics; Kielce University of Technology; Kielce Poland
6. Department of Earth Sciences; University of Geneva; Geneva Switzerland