Yasuo Miyakawa Takashi Kurokawa Akihiro Yamamura Yasushi Matsumoto Current Status of Japanese Government PKI Systems. 104-117 2008 EuroPKI http://dx.doi.org/10.1007/978-3-540-69485-4_8 conf/europki/2008 db/conf/europki/europki2008.html#MiyakawaKYM08