1. Bromley and Säckinger. Neural-network and K-nearest-neighbor classifiers. Technical Report 11359-910819-16TM AT&T 1991.
2. H. Zhang A. C. Berg M. Maire J. Malik "SVM-KNN: Discriminative nearest neighbor classification for visual category recognition" Proc. IEEE Conf. CVPR pp. 2126--2136 Jun. 2006.
3. J.-M. Guo and Y.-F. Liu, "License plate localization and character segmentation with feedback self-learning and hybrid binarization techniques," IEEE Trans. Veh. Tech., vol. 57, no. 3, pp. 1417--1424, May 2008.
4. M.-A. Ko and Y.-M. Kim, "Multifont and multisize character recognition based on the sampling and quantization of an unwrapped contour," in Proc. Int. Conf. Pattern Recognit., vol. 3. 1996, pp. 170--174.
5. M.-K. Kim and Y.-B. Kwon, "Recognition of gray character using Gabor filters," in Proc. Int. Conf. Inform. Fusion, vol. 1. 2002, pp. 419--424..