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Yong Xu, Tatsuya Hiramatsu, Kateryna Tarasenko, Toyoaki Nishida, Yoshiyasu Ogasawara, Takashi Tajima, Makoto Hatakeyama, Masashi Okamoto, Yukiko I. Nakano. A two-layered approach to communicative artifacts. AI Soc., 22(2):185-196, 2007. [doi]