Recommendation Effects of a Social Robot for Advertisement-Use Context in a Shopping Mall. - Masahiro Shiomi; Kazuhiko Shinozawa; Yoshifumi Nakagawa; Takahiro Miyashita; Toshio Sakamoto; Toshimitsu Terakubo; Hiroshi Ishiguro; Norihiro Hagita (Int. J. Soc. Robotics, 2013)