1. P. A. Rona,Science 299, 673 (2003).
2. D. W. Fuerstenau and K. N. Han,Extractive Metallurgy-Manganese Nodules.In:Marine Manganese Deposits (ed., G. P. Glasby), p. 357, Elsevier Scientific Publishing Company, Amsterdam (1977).
3. K. Jung,A Review of Processing of Deep-sea Nodules and crusts, CSIRO division of mineral and process engineering, CSIRO Com 788 (CSIRO Report), Australia (1993).
4. C. W. Nam, B. S. Kim, and K. H. Park,The Korean Soc. Geosystem Eng. 40, 191 (2003).
5. C. W. Nam, K. H. Park, and H. I. Kim,The Korean Soc. Geosystem Eng. 41, 413 (2004).