Geodesic
On the use of minimax properties in perturbation theory
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1959), pp. 94-100 
P. N. Knyazev. On the use of minimax properties in perturbation theory. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1959), pp. 94-100. http://geodesic.mathdoc.fr/item/IVM_1959_2_a8/
@article{IVM_1959_2_a8,
     author = {P. N. Knyazev},
     title = {On the use of minimax properties in perturbation theory},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {94--100},
     year = {1959},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_2_a8/}
}
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EP  - 100
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/IVM_1959_2_a8/
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%G ru
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