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100 _aKai Chen
245 _aVFA: A Variable-Factor Authentication Framework for Mobile Users
245 _cKai Chen, Weifeng Chen, Zhen Xu, Dongdai Lin, and Yazhe Wang
260 _bJournal of Communications
260 _c2015
300 _a10 : 6
650 _xCommunication
650 _xMedia Arts
856 _uhttp://www.jocm.us/index.php?m=content&c=index&a=lists&catid=147
999 _c307138
_d307138