1. E. Fix and U. L. Hodges, Jr., “Discriminatory Analysis, Nonparametric Discrimination, Consistency Properties,” Project No. 21-49-004, Report No. 4, Contract No. AF41(128)-31. USAF School of Aviation Medicine.
2. “Discriminatory Analysis: Small Sample Performance,”;Fix,1952
3. “Decision-making Processes in Pattern Recognition,”;Sebestyen,1962
4. “Learning Machines,”;Nils,1965
5. “Nearest Neighbor Pattern Classification,”;Cover;IEEE Transactions on Information Theory,1967