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We study linear perturbations of Donoghue classes of scalar Herglotz–Nevanlinna functions by a real parameter Q and their representations as impedance of conservative L-systems. Perturbation classes $${{\mathfrak {M}}}^Q$$ M Q , $${{\mathfrak {M}}}^Q_\kappa $$ M κ Q , $${{\mathfrak {M}}}^{-1,Q}_\kappa $$ M κ - 1 , Q are introduced and for each class the realization theorem...
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