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1. A commercial bibliographic database and retrieval service from DIALOG Information Services. 2. Interactive mathematics using a {graphics tablet} by Illinois Inst Tech, 1966. ["DIALOG: A Conversational Programming System with a Graphical Orientation", S.H. Cameron et al, CACM 10:349-357 (1967). Sammet 1969, p.255-258]. スポンサード リンク
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