J. Puzicha, T. Hofmann, und J. Buhmann. Computer Vision and Pattern Recognition, 1997. Proceedings., 1997
IEEE Computer Society Conf. on, Seite 267--272. (1997)
J. Wills, S. Agarwal, und S. Belongie. Computer Vision and Pattern Recognition, 2003. Proceedings. 2003
IEEE Computer Society Conf. on, 1, Seite I----37----I----44 vol.1. (2003)