Y. Gao, B. Zheng, G. Chen, Q. Li, C. Chen and G. Chen, “Efficient Mutual Nearest Neighbor Query Processing for Moving Object Trajectorie,” Information Sciences, Vol. 180, No. 11, 2010, pp. 2176-2195. doi:10.1016/j.ins.2010.02.010
 H. W. Liu, S. C. Zhang, J. M. Zhao, X. F. Zhao and Y. C. Mo, “A New Classification Algorithm Using Mutual Nearest Neighbors,” 9th International Conference on Grid and Cooperative Computing (GCC), Nan-jing, 1-5 November 2010, pp. 52-57.
 M. Z. Jahromi, E. Parvinnia and R. John, “A Method of Learning Weighted Similarity Function to Improve the Performance of Nearest Neighbor,” Information Sciences, Vol. 179, No. 17, 2009, pp. 2964-2973. doi:10.1016/j.ins.2009.04.012
 H. A. Fayed and A. F. Atiya, “A Novel Template Reduction Approach for the k-Nearest Neighbor Method,” IEEE Transactions on Neural Networks, Vol. 20, No. 5, 2009, pp. 890-896. doi:10.1109/TNN.2009.2018547
 A. Guttman, “R-Trees: A Dynamic Index Structure for Spatial Searching,” SIGMOD’84 Proceedings of the 1984 ACM SIGMOD International Confer-ence on Management of Data, Vol. 14, No. 2, 1984, pp. 47-57.
 J. H. Freidman, J. L. Bentley and R. A. Finkel, “An Algorithm for Finding Best Matches in Logarithmic Ex-pected Time,” ACM Transactions on Mathematical Software (TOMS), Vol. 3, No. 3, 1977, pp. 209-226. doi:10.1145/355744.355745
 B. Chazelle and L. J. Guibas, “Fractional Cascading: A Data Structuring Technique with Geometric Applications,” Proceedings of the 12th Colloquium on Automata, Languages and Programming, Vol. 194, 1985, pp. 9-100. doi:10.1007/BFb0015734
 S. A. Nene and S. K. Nayar, “A Simple Algorithm for Nearest Neighbor Search in High Di-mensions,” IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 19, No. 9, 1997, pp. 989-1003. doi:10.1109/34.615448