Yong Xu Yoshimasa Ohmoto Kazuhiro Ueda Takanori Komatsu Takeshi Okadome Koji Kamei Shogo Okada Yasuyuki Sumi Toyoaki Nishida Actively Adaptive Agent for Human-Agent Collaborative Task. 19-30 2009 AMT http://dx.doi.org/10.1007/978-3-642-04875-3_8 conf/amt/2009 db/conf/amt/amt2009.html#XuOUKOKOSN09