MathSciNet bibliographic data MR318958 (47 #7504) 47B50 (47A65) Kreĭn, M. G.; Langer, H. Über die $Q$$Q$-Funktion eines $\pi$$\pi$-hermiteschen Operators im Raume $\Pi \sb{\kappa }$$\Pi \sb{\kappa }$. (German) Acta Sci. Math. (Szeged) 34 (1973), 191–230. Journal

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