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Komilova Nigora J., Ergashev Tuhtasin G. «Holmgren problem for multudimensional elliptic equation with two singular coefficients» // Tomsk State University Journal of Mathematics and Mechanics 2020. №63 C.47-59
Ergashev Tuhtasin G., Safarbayeva Nigora M. «Dirichlet problem for the multudimensional Helmholtz equation with one singular coefficient» // Tomsk State University Journal of Mathematics and Mechanics 2019. №62 C.55-67