The Maximum Principle and the epsilon -technique for systems described by partial-difference equations. - Ming Y. Tarng; Louis R. Nardizzi (Inf. Sci., 1973)

Two-Dimensional E-Filtering Applied to Image Processing. - Panos P. Varoutas; Louis R. Nardizzi; Ernest M. Stokely (IEEE Trans. Syst. Man Cybern., 1976)