1. Department of Geosystems Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences Potsdam Germany
2. Department of Mathematics and Computer Science Università della Svizzera Italiana Lugano Switzerland
3. Department of Science Roma Tre University Rome Italy
4. Géosciences Montpellier, CNRS University of Montpellier Montpellier France
5. Department of Mathematics and Computer Science Free University Berlin Berlin Germany