%0 Book Section %A Ausiello, Giorgio %T Difficult logical theories and their computer approximations %B Journées algorithmiques %A Collectif %S Astérisque %D 1976 %P 3-21 %N 38-39 %I Société mathématique de France %U http://archive.numdam.org/item/AST_1976__38-39__3_0/ %G en %F AST_1976__38-39__3_0