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...57">Lu (1995), 57.</ref> His account was preserved and recorded in the 5th-century text of the ''[[Book of Later Han]]'' by [[Fan Ye (historian)|Fan Ye]] (398 ...177"/><ref name="wilson 2001 16">Wilson (2001), 16.</ref> In the 3rd&nbsp;century, [[Liu Hui]] made the calculation more accurate with his [[Liu Hui's π algo ...