Approximation of 2-D separable denominator recursive filters. - Bijan Lashgari; Leonard M. Silverman; Jean-François Abramatic (ICASSP, 1982)

2-D non-causal systems: State space modeling for half-plane support. - A. C. Hsueh; Jerry M. Mendel; Bijan Lashgari (ICASSP, 1983)