1. Iijima, T.: Basic theory on normalization of a pattern (in case of typical one-dimensional pattern). Bulletin of Electrotechnical Laboratory 26, 368–388 (1962) (in Japanese)
2. Witkin, A.P.: Scale–space filtering. In: Proc. 8th Int. Joint Conf. on Artificial Intelligence (IJCAI 1983), Karlsruhe, Germany, vol. 2, pp. 1019–1022 (1983)
3. Koenderink, J.J.: The Structure of Images. Biological Cybernetics 50, 363–370 (1984)
4. Weickert, J., Zuiderveld, K.J., ter Haar Romeny, B.M., Niessen, W.J.: Parallel implementations of AOS schemes: A fast way of nonlinear diffusion filtering. In: Proceedings of the 4th International Conference on Image Processing, Santa Barbara, CA, USA, vol. 3, pp. 396–399. IEEE Computer Society Press, Los Alamitos (1997)
5. Deriche, R.: Recursively Implementing the Gaussian and its Derivatives. In: Srinivasan, V., Heng, O.S., Hock, A.Y. (eds.) Proceedings of the 2nd Singapore International Conference on Image Processing, pp. 263–267. World Scientific, Singapore (1992)