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Vestn. St. Petersbg. Univ., Math. 43, No. 2, 74-81 (2010); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 2010, No. 2, 71-79 (2010).
MSC:  34D30 34D10
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