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St. Petersburg: St. Petersburg State University (ISBN 978-5-85766-061-0). 234 p. (2009).
MSC:  93-02 34D20 93D09
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Dokl. Math. 80, No. 3, 947-949 (2009); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 429, No. 3, 322-324 (2009).
MSC:  93D09
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