13 citations to https://www.mathnet.ru/eng/dan27053
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G. G. Kazaryan, “On a functional index of hypoellipticity”, Math. USSR-Sb., 56:2 (1987), 333–347
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G. G. Kazaryan, G. A. Karapetyan, “On the convergence of Galerkin approximations to the solution of the Dirichlet problem for some general equations”, Math. USSR-Sb., 52:2 (1985), 285–299
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E. Madzhenes, “Interpolyatsionnye prostranstva i uravneniya v chastnykh proizvodnykh”, UMN, 21:2(128) (1966), 169–218