Why people play: artificial lives acquiring play-instinct to stabilize productivity. - Shinichi Tamura; Shoji Inabayashi; Waichi Hayakawa; Takahiro Yokouchi (CEC, 2000)

Why People Play: Artificial Lives Acquiring Play Instinct to Stabilize Productivity. - Shinichi Tamura; Shoji Inabayashi; Waichi Hayakawa; Takahiro Yokouchi; Hiroshi Mitsumoto; Hisashi Taketani (Comput. Intell. Neurosci., 2012)