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3. Youla, D. C., An introduction to coupled-line network theory, Memorandum 54, Polytech. Inst. Brooklyn, PIBMRI-960–61, Oct. 1961.
4. Sufficient conditions for admittance matrix realizable in characteristic admittance of multiline;Saito;Record Elec. Commun. Engr. Conversazione, Tohoku Univ.,1963
5. Fundamental Properties of a Network Consisting of an n-Wire Line Terminated at One End;Matsumoto,1963