2 citations to https://www.mathnet.ru/rus/mzm1331
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Anatoly Stepin, Sergey Tikhonov, Contemporary Mathematics, 772, Topology, Geometry, and Dynamics, 2021, 311
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Giraud O., Thas K., “Hearing Shapes of Drums: Mathematical and Physical Aspects of Isospectrality”, Rev. Mod. Phys., 82:3 (2010), 2213–2255