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Sergei Aleksandrovich Nazarov, “Influence of Winkler - Steklov conditions on natural oscillations of elastic weighty body”, Ufimsk. Mat. Zh., 16, № 1, 2024, 53
S. A. Nazarov, “Asymptotic Analysis of Eigenvalues for Concentrated Masses Approaching One Another”, Comput. Math. and Math. Phys., 64, № 10, 2024, 2285