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- E. L. Shishkina, Transmutation Operators and Applications, 2020, 237
- Elina Shishkina, Sergei Sitnik, Transmutations, Singular and Fractional Differential Equations with Applications to Mathematical Physics, 2020, 275
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- Elina Shishkina, Sergei Sitnik, Transmutations, Singular and Fractional Differential Equations with Applications to Mathematical Physics, 2020, 433
- E. L. Shishkina, Operator Theory and Differential Equations, 2021, 229