YOSIFOV, D.; RADICHEV, R. Earth’s crust of large deposits of non-ferrous metals in Bulgaria. Geofizicheskiy Zhurnal, [S. l.], v. 40, n. 1, p. 3–14, 2018. DOI: 10.24028/gzh.0203-3100.v40i1.2018.123994. Disponível em: http://journals.uran.ua/geofizicheskiy/article/view/123994. Acesso em: 15 aug. 2022.