1. LANE K F. Choosing the optimum cut-off grade [J]. Quarterly of the Colorado School of Mines, 1964, 59: 811–829.
2. LANE K F. Cut-off grades for two minerals [C]//Proceedings of the 18th International Symposium on the Application of Computers and Operations Research in the Minerals Industries (APCOM1984). London, 1984: 485–492.
3. LANE K F. The economic definition of ore: Cut-off grades in theory and practice [M]//Mining Journal Books (ISBN: 0 900117 45 1). London, UK, 1988.
4. SHINKUMA T, NISHIYAMA T. The grade selection rule of the metal mines: An empirical study on copper mines [J]. Resources Policy, 2000, 26: 31–38.
5. CAIRNS R D, SHINKUMA T. The choice of cutoff grade in mining [J]. Resource Policy, 2003, 29: 75–81.