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Methodical notes
On some variational principles in the theory of operator equations
M. M. Vainberg
Citation:
M. M. Vainberg, “On some variational principles in the theory of operator equations”, Russian Math. Surveys, 7:2 (1952)
Linking options:
https://www.mathnet.ru/eng/rm8316 https://www.mathnet.ru/eng/rm/v7/i2/p197
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