Zhiwei Gao Ping Luo Zhimin Gu Hongjun Liu A New and Scalable Certification Path Discovery Model in the Emerging Global PKI. 372-380 2007 conf/mue/2007 MUE http://doi.ieeecomputersociety.org/10.1109/MUE.2007.33 db/conf/mue/mue2007.html#GaoLGL07