On the Hardness of Category Tree Construction
by
Shay Gershtein (Tel Aviv University, Israel), Uri Avron (Tel Aviv University, Israel), Ido Guy (Ben-Gurion University of the Negev, Beer Sheva, Israel), Tova Milo (Tel Aviv University, Israel) and Slava Novgorodov (eBay Research, Netanya, Israel)
Linear Programs with Conjunctive Queries
by
Florent Capelli, Nicolas Crosetti, Joachim Niehren and Jan Ramon (Univ. Lille, Inria, CNRS, UMR 9189 - CRIStAL, F-59000 Lille, France)