1. Method for obtaining copper, nickel, cobalt and manganese from manganese nodules;Meixer,1974
2. Process for recovering manganese from its ores;Kane,1974
3. Halidation of manganese ores to obtain metal values and recycle of halide values;Cardwell,1976
4. Winning of metal values from ores containing recycled acid leaching agent;Kane,1972
5. Extraction of metals from manganese containing nodules from the ocean floor;Van Peteghem,1977