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Liu Hui had established a solid algorithm for calculating pi.
Xue-Hui Liu has written:
'Interaction between a crack and a soft inclusion' -- subject(s): Fracture mechanics
Xue Hui Liu has written:
'Zeng Guo Fan'
Fuzhi Liu has written:
'Liu Fuzhi hui yi lu' -- subject(s): Communists, Biography, Public prosecutors
You can find a description of the algorithm in the Wikipedia article titled "Liu Hui's π algorithm".