Saveliev, Nikolai. Lectures on the Topology of 3-Manifolds [[electronic resource]]: an Introduction to the Casson Invariant. — 2nd ed. — Berlin: De Gruyter, 2011. — 1 online resource (219 p.). — Доступ по паролю из сети Интернет (чтение, печать, копирование). — <URL:https://elib.spbstu.ru/ebsco/pdf/430060.pdf>. — Текст: электронный
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