Luca Cabibbo. Expressiveness of Semipositive Logic Programs with Value Invention. In Dino Pedreschi, Carlo Zaniolo, editors, Logic in Databases, International Workshop LID 96, San Miniato, Italy, July 1-2, 1996, Proceedings. Volume 1154 of Lecture Notes in Computer Science, pages 457-474, Springer, 1996.
Abstract is missing.