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4. R. G. Longoria, Wave-Scattering Formalisms for Multiport Energetic Systems, J. Franklin Inst., 333(B), 539 (1996).
5. H. M. Paynter and I. J. Busch-Vishniac, Wave-Scattering Approaches to Conservation and Causality, J. Franklin Inst., 325, 295 (1988).