Keinosuke Fukunaga Donald M. Hummels Leave-One-Out Procedures for Nonparametric Error Estimates. 421-423 1989 11 IEEE Trans. Pattern Anal. Mach. Intell. 4 http://computer.org/tpami/tp1989/i0421abs.htm db/journals/pami/pami11.html#FukunagaH89