Yoshiaki Yasumura Takahiko Kamiryo Shohei Yoshikawa Kuniaki Uehara Acquisition of a concession strategy in multi-issue negotiation. 161-171 2009 7 Web Intelligence and Agent Systems 2 http://dx.doi.org/10.3233/WIA-2009-0160 db/journals/wias/wias7.html#YasumuraKYU09