1. Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, I-41125 Modena, Italy
2. Commission for Geosciences, Austrian Academy of Sciences, Dr. Ignaz Seipel-Platz 2, A-1010 Vienna, Austria
3. Department of Geology and Geoinformatics, University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., BG-1700 Sofia, Bulgaria
4. Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, BG-1113 Sofia, Bulgaria
5. Department of Earth Sciences, University of Pisa, Via Santa Maria 53, I-56126 Pisa, Italy
6. Department of Biological, Geological and Environmental Sciences, University of Bologna, Piazza di Porta San Donato 1, I-40126 Bologna, Italy
7. Department of Regional Geology, Faculty of Mining and Geology, University of Belgrade, Kamenička 6, 11000 Belgrade, Serbia
8. Department of Geology, Faculty of Biology and Geology, ‘Babeş-Bolyai’ University, Strada M. Kogălniceanu 1, 400084 Cluj-Napoca, Romania
9. Instituto Geológico y Minero de España (IGME-CSIC), La Calera 1, E-28760 Tres Cantos, Spain
10. Departamento GEODESPAL, Facultad de Ciencias Geológicas, Instituto de Geociencias (CSIC, UCM), José Antonio Nováis 12, E-28040 Madrid, Spain