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Submitted on: 07 March 2015.
Revised on: 10 April 2015.
Accepted on: 30 April 2015.
NULL
Submitted on: 07 April 2005.
Revised on: 17 May 2005.
Accepted on: 24 May 2005.
Mineral Economics---SPRINGER HEIDELBERG
Submitted on: 11 March 2008.
Revised on: 20 April 2008.
Accepted on: 04 May 2008.
NULL