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K. Maurin, Methods of Hilbert Spaces, Hafner (1972).
M. M. Vainberg, Variational Methods of Investigating Nonlinear Operators [in Russian], Nauka, Moscow (1956).
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Saratov State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 7, No. 4, pp. 83–84, October–December, 1973.
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Zelenko, L.B. Friedrichs extension of some nonlinear operators. Funct Anal Its Appl 7, 326–327 (1973). https://doi.org/10.1007/BF01075741
- Functional Analysis
- Nonlinear Operator