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Original Russian Text © M. S. Denisov, 2016, published in Matematicheskie Zametki, 2016, Vol. 100, No. 3, pp. 469–472.
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Denisov, M.S. Spectral points of type π + and π − of operator-valued functions taking values in the set of unbounded operators. Math Notes 100, 491–494 (2016). https://doi.org/10.1134/S0001434616090182
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DOI: https://doi.org/10.1134/S0001434616090182