Geodesic
Best approximation of unbounded operators by bounded operators
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1995), pp. 42-68.

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@article{IVM_1995_11_a3,
     author = {V. V. Arestov and V. N. Gabushin},
     title = {Best approximation of unbounded operators by bounded operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {42--68},
     publisher = {mathdoc},
     number = {11},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1995_11_a3/}
}
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V. V. Arestov; V. N. Gabushin. Best approximation of unbounded operators by bounded operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1995), pp. 42-68. http://geodesic.mathdoc.fr/item/IVM_1995_11_a3/