Herzig, P. M., Petersen, S., and Hannington, M. D., 2002, Polymetallic massive sulphide deposits at the modern seafloor and their resource potential, in Polymetallic Massive Sulphides and Cobalt-rich Ferromanganese Crusts -- Status and Prospects: United Nations International Seabed Authority, Technical Study No. 2, pp. 7 - 35.
Herzig, P.M., Petersen, S., and Hannington, M.D., 2002, Polymetallic massive sulphide deposits at the modern seafloor and their resource potential, in Polymetallic Massive Sulphides and Cobalt-rich Ferromanganese Crusts - Status and Prospects: U.N. International Seabed Authority, Technical Study No. 2, pp. 7-35.