[10] Mack Y P, MackM Rosenblatt. Multivariatek-nearest neighbor density estimates[J]. Journal of Multivariate Analysis, 1979(9): 1-15.

[11] Hall P, Park B U, Samworth R J. Choice of neighbor order in nearest -neighbor classification[J]. The Annals of Statistics, 2008, 3(6):2135-2152.

[12] PARZEN E. On estimation of a probability density function and mode[J]. The Annals of Mathematical Statistics, 1962, 33(3): 1065-1076．

[15] Tamura Hideyuki, Mori Shunji, Yamawaki Takashi. Textural features corresponding tovisual perception[J]. IEEE Transactions on Systems, Man and Cybernetics, 1978, 8(6): 460-473.

[21] Kullback S, Leibler R A. On information and sufficiency[J]. The Annals of Mathematical Statistics,1951(22): 79-86．