MathSciNet bibliographic data MR282238 (43 #7951a) 47.30 Kreĭn, M. G.; Langer, G. K. The defect subspaces and generalized resolvents of a Hermitian operator in the space $\Pi \sb{\kappa }$$\Pi \sb{\kappa }$. (Russian) Funkcional. Anal. i Priložen 5 1971 no. 2, 59–71. Links to the journal or article are not yet available

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