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Dedicated to M. A. Naimark on the occasion of his 60th birthday.
Dresden Technical University. Odessa Structural Engineering Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 5, No. 2, pp. 59–71, April–June, 1971.
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Krein, M.G., Langer, G.K. Defect subspaces and generalized resolvents of an Hermitian operator in the space Πϰ . Funct Anal Its Appl 5, 136–146 (1971). https://doi.org/10.1007/BF01076418
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DOI: https://doi.org/10.1007/BF01076418