MathSciNet bibliographic data MR481850 42A08 Kreĭn, M. G.; Nudel′man, P. Ja. Approximation of functions in $L\sb{2}(\omega \sb{1},\omega \sb{2})$$L\sb{2}(\omega \sb{1},\omega \sb{2})$ by transmission functions of linear systems with minimal energy. (Russian) Problemy Peredači Informacii 11 (1975), no. 2, 37–60. Links to the journal or article are not yet available

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