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Books about Kejiu:
The Yuan Dynasty Verse Writers: Zhang KeJiu Biography (Chinese Edition) by Zhong XueMin (Aug 1, 2007)
Kejiu Si Fu handwriting Canopus volume (paperback) by KE JIU SI (1991)
Zhang Kejiu ji jiao zhu (Liang Zhe zuo jia wen cong) (Mandarin Chinese Edition) by Weifen Lu (1995)
Wiki information Kejiu:
Yuan Kejiu was a son of Yuan Shikai.