Dennis Y. W. Liu Duncan S. Wong Xinyi Huang Guilin Wang Qiong Huang Yi Mu Willy Susilo Formal Definition and Construction of Nominative Signature. 57-68 2007 conf/icics/2007 ICICS http://dx.doi.org/10.1007/978-3-540-77048-0_5 db/conf/icics/icics2007.html#LiuWHWHMS07