Geodesic
Perturbation theory for $J$-positive operators
Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 2, pp. 61-62 
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/
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     title = {Perturbation theory for $J$-positive operators},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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