%D 1970 %L acta24511 %J Acta mineralogica-petrographica %C Szeged %T Some problems in determining the oxidation state of sedimentary rocks : preliminary report %P 129-141 %O Bibliogr.: 141. p. %A Grasselly Gyula %A HetĂŠnyi Magdolna %N 2 %V 19 %K KĹzettan, ĂsvĂĄnytan, FĂśldtan %I University of Szeged, Department of Mineralogy, Geochemistry and Petrology