Varentsov, M. - Grasselly, M. (szerk.): Manganese deposits on continents - Geology and geochemistry of manganese 2. (Budapest, 1980)
GEOLOGY V0LZ GEOCHEMISTRY MANGANESE MANGANESE DEPOSITS í J Й i ÍILmIŰ 1 Ulik-i J h ( ВВВв Ы'ШУШ H ■HWhHB IS в Edited by I.M.VARENTSOV sod GY. GRASSEUY AKADÉMIAI KIADÓ, DDDAPEST