Victor Felea. A Strong Containment Problem for Queries in Conjunctive Form with Negation. In Qiming Chen, Alfredo Cuzzocrea, Takahiro Hara, Ela Hunt, Manuela Popescu, editors, The First International Conference on Advances in Databases, Knowledge, and Data Applications, DBKDS 2009, Gosier, Guadeloupe, France, 1-6 March 2009. pages 114-119, IEEE Computer Society, 2009. [doi]