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3. English translation: J. Math. Sci., 253, No. 1, 108-121 (2021), https://doi.org/10.1007/s10958-021-05216-6
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5. English translation: Mater. Sci., 54, No. 3, 368-377 (2018), https://doi.org/10.1007/s11003-018-0194-z