Performance limitations for distributed amplifiers. - Herbert J. Carlin; Pier Paolo Civalleri (Eur. Trans. Telecommun., 1990)

A general theory for broad-band matching of two-ports with applications to fet amplifiers with internal feedback. - Herbert J. Carlin; Pier Paolo Civalleri (Int. J. Circuit Theory Appl., 1991)

On darlington's realization of matrix-valued non-rational functions and the impossibility of selective flat gain. - Herbert J. Carlin; Pier Paolo Civalleri (Int. J. Circuit Theory Appl., 1993)