( -; . . , . 盘, : suànpán) ().
« » () (岳) (190 )[1] . , -, XII . , . . («») (), («») . .
. 4 , .[2]
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- Peng Yoke Ho, page 71
- / . . , . .: , 1970. . I. . 158-171.
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- .. , .: 1951.
- Peng Yoke Ho Li, Qi and Shu: An Introduction to Science and Civilization in China. Courier Dover Publications. ISBN 0486414450