Ik Rae Jeong Jeong Ok Kwon Dong Hoon Lee Ring Signature with Weak Linkability and Its Applications. 1145-1148 2008 20 IEEE Trans. Knowl. Data Eng. 8 http://dx.doi.org/10.1109/TKDE.2008.19 db/journals/tkde/tkde20.html#JeongKL08