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Quan, He Jun. “Research on scale and precision of the water clock in ancient China.” History of Oriental Astronomy, pp. 57-61. (Proceedings of the International Astronomical Union Colloquium No. 91 held in New Delhi, November 13-16, 1985). Edited by G. Swarup, A. K. Bag and K. S. Shukla. Cambridge University Press, Cambridge, 1987. ISBN 0-521-34659-2.

Walsh, Jennifer Robin. “Ancient Chinese Astronomical Technologies.” American Physical Society, Northwest Section. May, 2004. Meeting, 21-22 May, 2004. Pullman, WA.