Seung-Hyun Seo Jung Yeon Hwang Kyu Young Choi Dong Hoon Lee Identity-based universal designated multi-verifiers signature schemes. 288-295 2008 30 Computer Standards & Interfaces 5 http://dx.doi.org/10.1016/j.csi.2007.08.020 db/journals/csi/csi30.html#SeoHCL08