MathSciNet bibliographic data MR1949874 47A55 (47B25 47N50 81Q15) Albeverio, S.; Koshmanenko, V.; Kurasov, P.; Nizhnik, L. On approximations of rank one \$\scr H\sb {-2}\$$\scr H\sb {-2}$-perturbations. Proc. Amer. Math. Soc. 131 (2003), no. 5, 1443–1452. Article

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