Keldysh Problem for a Three-Dimensional Equation of Mixed Type With Three Singular Coefficients in a Semi-Infinite Parallelepiped
Vestnik Udmurtskogo Universiteta: Matematika, Mekhanika, Komp'yuternye Nauki - Russian Federation
doi 10.35634/vm200103
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Date
March 1, 2020
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Udmurt State University