Ren-Chiun WangWen-Shenq JuangCHIN-LAUNG LEI2018-09-102018-09-102009-02http://scholars.lib.ntu.edu.tw/handle/123456789/351968User Authentication Scheme with Privacy-preservation for Multi-server Environmentjournal article10.1109/LCOMM.2009.0818842-s2.0-61449086383WOS:000263374800021