On L. N. Shevrin's Problem
Huang Yunbao
Chinese Quarterly Journal of Mathematics . 1993, (2): 60 -62 . 

Copyright © Chinese Quarterly Journal of Mathematics, All Rights Reserved.
Tel: 0371-23881698　E-mail: sxjk@henu.edu.cn　QQ: 2454327236
Powered by Beijing Magtech Co., Ltd.