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De Gruyter studies in mathematics ;. — Текст: электронный.
Recent Developments in Sturm-Liouville Theory. — 76. / Anton Zettl. — 1 online resource. — (De Gruyter Studies in Mathematics). — Доступ по паролю из сети Интернет (чтение, печать, копирование). — <URL:https://elib.spbstu.ru/ebsco/pdf/2739068.pdf>. — Текст: электронный
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