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Статья Gadjiev, T. An initial-boundary value problem for systems of linear partial differential equations with a differential operator of Gegenbauer type / T. Gadjiev,
V. S. Guliyev,
E. J. Ibragimov // Transactions of A. Razmadze Mathematical Institute. – 2021. – Vol.175, iss. 3. – С. 345-354.