Ying & Zhang 2006, "Ruiyun Xu, a student of Carathéodory, directed my thesis. She wrote an excellent book on real variables and later became Chairwoman of the Department of Mathematics at Hangzhou University. Ying, Zhiliang; Zhang, Cun-Hui (2006). "A Conversation with Yuan Shih Chow". Statistical Science. 21 (1): 99–112. arXiv:math/0606550v1. doi:10.1214/088342304000000224.
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Xue, Liu & Peng 2020, p. 524. Xue, Youcai; Liu, Wei; Peng, Jia (2020). 浙江大学函数论学派1928—1950年的学术贡献 [An investigation on contributions from the school of function theory in Zhejiang University from 1928 to 1950]. Journal of Zhejiang University (Science Edition). 47 (5). doi:10.3785/j.issn.1008-9497.2020.05.001.
Xue, Liu & Peng 2020, p. 523. Xue, Youcai; Liu, Wei; Peng, Jia (2020). 浙江大学函数论学派1928—1950年的学术贡献 [An investigation on contributions from the school of function theory in Zhejiang University from 1928 to 1950]. Journal of Zhejiang University (Science Edition). 47 (5). doi:10.3785/j.issn.1008-9497.2020.05.001.
Ying & Zhang 2006, "Ruiyun Xu, a student of Carathéodory, directed my thesis. She wrote an excellent book on real variables and later became Chairwoman of the Department of Mathematics at Hangzhou University. Ying, Zhiliang; Zhang, Cun-Hui (2006). "A Conversation with Yuan Shih Chow". Statistical Science. 21 (1): 99–112. arXiv:math/0606550v1. doi:10.1214/088342304000000224.