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Gutiérrez-Basulto, V. and Jung, J.C. and Kontchakov, Roman (2016) Temporalized EL ontologies for accessing temporal data: complexity of atomic queries. In: Kambhampati, S. (ed.) Proceedings of the Twenty-Fifth International Joint Conference on Artificial Intelligence (IJCAI-16). Palo Alto, California, USA: AAAI Press, pp. 1102-1108. ISBN 9781577357704.
Gutiérrez-Basulto, V. and Ibáñez-García, Y. and Kontchakov, Roman and Kostylev, E.V. (2015) Queries with negation and inequalities over lightweight ontologies. Web Semantics: Science, Services and Agents on the World Wide Web 35 (4), pp. 184-202. ISSN 1570-8268.
Gutiérrez-Basulto, V. and Ibáñez-García, Y. and Kontchakov, Roman and Kostylev, E. (2013) Conjunctive queries with negation over DL-Lite: a closer look. In: Faber, W. and Lembo, D. (eds.) Web Reasoning and Rule Systems. LNCS 7994. Berlin, Germany: Springer, pp. 109-122. ISBN 9783642396656.
Gutiérrez-Basulto, V. and Ibáñez-García, Y. and Kontchakov, Roman (2012) An update on query answering with restricted forms of negation. In: Krotzsch, M. and Straccia, U. (eds.) Web Reasoning and Rule Systems. Lecture Notes in Computer Science 7497. Berlin, Germany: Springer, pp. 75-89. ISBN 9783642332029.