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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 2, pp. 151–158, February, 1989.
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Derkach, V.A., Malamud, M.M. & Tsekanovskii, é.P. Sectorial extensions of a positive operator and the characteristic function. Ukr Math J 41, 136–142 (1989). https://doi.org/10.1007/BF01060376
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DOI: https://doi.org/10.1007/BF01060376