Shohei Yoshikawa Yoshiaki Yasumura Kuniaki Uehara Strategy Acquisition on Multi-issue Negotiation without Estimating Opponent's Preference. 371-380 2008 KES-AMSTA http://dx.doi.org/10.1007/978-3-540-78582-8_38 conf/kesamsta/2008 db/conf/kesamsta/kesamsta2008.html#YoshikawaYU08