Three Graphical Tests for the Stability of Multidimensional Digital Filters.
Raymond A. DeCarlo, Richard E. Saeks, J. Murray · Defense Technical Information Center (DTIC) · 1977
This paper discusses three graphical tests for determining the stability of multidimensional digital filters characterized by an appropriate transfer function in several complex variables. Each test is carried out as a finite number of Nyquist plots in the complex plane. (Author)