| Institution: | 1. Institute for Geology and Palaeontology, Basel University, 4056 Basel, Switzerland;2. Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;3. Institute of Geochemistry and Petrology, ETH-Zürich, 8092 Zürich, Switzerland;4. Faculty of Mining and Geology, University of Belgrade, 11000 Belgrade, Serbia;5. Faculty of Natural and Technical Sciences, University “Goce Delčev”, 2000 Štip, Republic of Macedonia;6. Faculty of Geology and Geography, University “St. Kl. Ohridski”, 1504 Sofia, Bulgaria |
