Varentsov, M. - Grasselly, M. (szerk.): General problems: mineralogy, geochemistry, methods - Geology and geochemistry of manganese 1. (Budapest, 1980)
Proceedings of the 2nd International Symposium on Geology and Geochemistry of Manganese, held in Sydney, Australia, 17—24 August 1976 Editors I.M. Varentsov (USSR) and Gy. Grasselly (Hungary) Editorial board R.G. Burns (ass. ed., USA), D.S. Cronan (ass. ed., UK), J.E. Cudjoe (Ghana), S. Roy (ass. ed., India), E. Seibold (FRG), R.K. Sorem (ass. ed., USA), H. Walther (FRG)