Preference Estimation via Opponent Modeling in Multi-Agent Negotiation. - Yuta Konishi; Kento Yamamoto; Eisuke Sonomoto; Rikuho Takeda; Ryo Furukawa; Yusuke Muraki; Takafumi Shimizu; Kazuma Fukumura; Yuya Kanemoto; Takayuki Ito 001; Shiyao Ding (CoRR, 2026)