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3. English translation: J. Math. Sci., 178, No. 5, 512-530 (2011), https://doi.org/10.1007/s10958-011-0566-5
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5. English translation: Mater. Sci., 43, No. 3, 291-299 (2007), https://doi.org/10.1007/s11003-007-0034-z