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2. Alpay, D., Ball, J., Peretz, Y.: System theory, operator models and scattering: the time-varying case. J. Oper. Theory 47(2), 245–286 (2002)
3. Progress in Systems and Control Theory;D. Alpay,1990
4. Oper. Theory Adv. Appl.;D. Alpay,1990
5. Alpay, D., Dijksma, A., Peretz, Y.: Nonstationary analogs of the Herglotz representation theorem: the discrete case. J. Funct. Anal. 166(1), 85–129 (1999)