1. Nonlinear filtering of multiplied and convolved signals;Oppenheim;Proc. I.E.E.E.,1968
2. On nonlinear filters involving transformation of the time variable;Moore;I.E.E.E., Trans. Inform. Theory,1973
3. Two-dimensional E-filter applied to image processing;Varoutas;I.E.E.E., Trans. Sys. Man. Cyben.,1976
4. J. W. Tukey, Nonlinear (nonsuperposable) methods for smoothing data, in Cong. Rec., 1974 EASCON, pp. 673.
5. Application of a nonlinear smoothing algorithm to speech processing;Rabiner;I.E.E.E., Trans. Acoust. Speech Sig. Process.,1975