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Phenomenon of mud volcanoes in western Romania as a geotourism object / MADEJA G., MROWCZYK P. // W: XIX Congress of the Carpathian-Balkan Geological Association : September 23–26, 2010, Thessaloniki, Greece : proceedings / eds. Christofides G. [et al.] ; Aristotle University of Thessaloniki. Faculty of Sciences. — Thessaloniki : [s. n.], 2010. — (Scientific Annals of the School of Geology ; spec. vol. 100). — ISBN: 978-960-9502-02-3. — S. 491–502. — Bibliogr. s. 502, Abstr.