余嘉元。项目反应理论及其应用。南京：江苏教育出版社，1992。
Yu J Y. Item Response Theory Application (in Chinese). Nanjing: Jiangshu Education Publishing House, 1992
男子200米仰泳决赛，中国选手徐嘉余排名第四；
In men's 200m backstroke finals, Xu Jiayu of China ranked fourth.
男子200米仰泳决赛，中国选手徐嘉余排名第四；
In men's 200m backstroke finals, Xu Jiayu of China ranked fourth.
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