4 citations to https://www.mathnet.ru/rus/faa560
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Roohian H., Shafarevich A.I., “Semiclassical Asymptotic Behavior of the Spectrum of a Nonselfadjoint Elliptic Operator on a Two-Dimensional Surface of Revolution”, Russian Journal of Mathematical Physics, 17:3 (2010), 328–333
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Roohian, H, “Semiclassical asymptotics of the spectrum of a nonselfadjoint operator on the sphere”, Russian Journal of Mathematical Physics, 16:2 (2009), 309
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Stepin, SA, “On the condition number of the system of eigen functions for nonlinear spectral problem”, Doklady Akademii Nauk, 364:2 (1999), 170
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С. А. Степин, “Несамосопряженные сингулярные возмущения и спектральные свойства
краевой задачи Орра–Зоммерфельда”, Матем. сб., 188:1 (1997), 129–146 ; S. A. Stepin, “Non-selfadjoint singular perturbations and spectral properties of the Orr–Sommerfeld boundary-value problem”, Sb. Math., 188:1 (1997), 137–156