1. ε-Separating nonlinear digital filter and its applications;Harashima;Electronics and Communications in Japan, Part 1,1982
2. Statistical analysis of ε-separating nonlinear digital filters;Arakawa;Electronics and Communications in Japan, Part 1,1983
3. Recursive ε-nonlinear digital filter;Arakawa;Electronics and Communications in Japan, Part 1,1983
4. H. Kondo, K. Hanari, K. Shimizu, K. Arakawa, Colored face image processing by vector ε-filter—Removal of wrinkles, in: IEICE General Conference No. D-11-143, March 1998 (in Japanese).
5. Nonlinear inverse filter using ε-filter and its application to image restoration;Watabe;IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,2000