Kóbor Balázs; Geiger János; Gössler Walter; Pál Molnár Elemér: Radioactiv characteristics of the liassic coal of Pécsbánya and effects of its mining on the environment (Mecsek Mts. - South Hungary). In: Acta mineralogica-petrographica, (43). pp. 59-63. (2002)