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@article{IVM_1988_2_a4, author = {L. B. Zelenko}, title = {Locally selfadjoint extensions of nonlinear operators, and {Lagrangian} {manifolds.~I}}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {22--31}, publisher = {mathdoc}, number = {2}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1988_2_a4/} }
L. B. Zelenko. Locally selfadjoint extensions of nonlinear operators, and Lagrangian manifolds.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1988), pp. 22-31. http://geodesic.mathdoc.fr/item/IVM_1988_2_a4/