引用本文:

施咸亮. Hermann逼近问题[J]. 浙江大学学报（理学版）, .

Shi Xianliang. On a Hermann's Approximation Problem. Journal of ZheJIang University(Science Edition), .

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http://www.zjujournals.com/xueshu/sci/CN/    或    http://www.zjujournals.com/xueshu/sci/CN/Y0/V/I/1