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Cowen, Ron. Gravity's century: from Einstein's eclipse to images of black holes / Ron Cowen. — 1 online resource (viii, 181 pages) : illustrations. — Доступ по паролю из сети Интернет (чтение, печать, копирование). — <URL:https://elib.spbstu.ru/ebsco/pdf/2092894.pdf>. — Текст: электронный
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