Geodesic
Perturbation theory for $J$-positive operators
Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 2, pp. 61-62

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@article{FAA_1975_9_2_a8,
     author = {R. V. Akopyan},
     title = {Perturbation theory for $J$-positive operators},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {61--62},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1975_9_2_a8/}
}
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R. V. Akopyan. Perturbation theory for $J$-positive operators. Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 2, pp. 61-62. http://geodesic.mathdoc.fr/item/FAA_1975_9_2_a8/