《魏书·列传·卷七》
高祖思虑深入，参考经传记载，以一黍的大小，来确定分的规格，依据它为尺，公布施行。
高祖睿思玄深，参考经记，以一黍之大，用成分体，准之为尺，宣布施行。
The founding emperor thought deeply, referenced the Classics and histories, used the size of one grain of millet to determine the specifications for the fen, and made it public and implemented it based on it.