1. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
2. Faculty of Physics, University of Bucharest, 077125 Măgurele, Romania
3. Emil Racovita Institute of Speleology, Romanian Academy, 400006 Cluj-Napoca, Romania
4. Faculty of Forestry, Ștefan cel Mare University, 720229 Suceava, Romania
5. Department of Chemistry, Physics and Environment, University “Dunărea de Jos”, 800008 Galaţi, Romania