Книга: Мистерия Сириуса
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Beer А., Но Ping-yu, Lu Gwei-Djen, NeedhamJ., PulleyblaiA, E. G. and Thompson G. I. An Sth-Century Meridian Line: I-Hsing's Chain of Gnomons and the Pre-history of the Metric System. Vistas Astronomy, Pergamon Press, Oxford etc. Vol. 4, 1964, pp. 3–28.
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