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Vestn. St. Petersbg. Univ., Math. 51, No. 1, 1-8 (2018); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 5(63), No. 1, 3-12 (2018).
MSC:  49J52 93B27
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