@article{CSIS_2008_5_2_a4,
     author = {Nuno Lopes and Cl\'audio Fernandes and Salvador Abreu},
     title = {Representing and {Querying} {Multiple} {Ontologies} with {Contextual} {Logic} {Programming}},
     journal = {Computer Science and Information Systems},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/CSIS_2008_5_2_a4/}
}