Dov M. Gabbay. What Is Negation as Failure?. In Alexander Artikis, Robert Craven, Nihan Kesim Cicekli, Babak Sadighi, Kostas Stathis, editors, Logic Programs, Norms and Action - Essays in Honor of Marek J. Sergot on the Occasion of His 60th Birthday. Volume 7360 of Lecture Notes in Computer Science, pages 52-78, Springer, 2012. [doi]
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