[1]
Varentsov, M. - Grasselly, M. (szerk.):
General problems: mineralogy, geochemistry, methods
Budapest, 1980
[2]
Varentsov, M. - Grasselly, M. (szerk.):
Manganese deposits on continents
Budapest, 1980
[3]
Varentsov, M. - Grasselly, M. (szerk.):
Manganese on the bottom of recent basins
Budapest, 1980