Rie Shigetomi Akira Otsuka Takahide Ogawa Hideki Imai An Anonymous Loan System Based on Group Signature Scheme. 244-256 2002 conf/isw/2002 ISC http://link.springer.de/link/service/series/0558/bibs/2433/24330244.htm db/conf/isw/isc2002.html#ShigetomiOOI02