M. Fukumi, S. Omatu, F. Takeda, und T. Kosaka. Proceedings of the IEEE International joint Conference on Neural
Networks 1991, IJCNN'91, 2, Seite 1027-1032. IEEE Computer Society, (1991)
A. Khotanzad, und J. Lu. Computer Vision and Pattern Recognition, 1989. Proceedings CVPR '89.,
IEEE Computer Society Conference on, Seite 200--205. IEEE Computer Society, (1989)