@article{CSIS_2013_10_1_a6,
     author = {Guillem Rull and Carles Farr\'e and Ernest Teniente and Toni Urp{\'\i}},
     title = {Validation of {Schema} {Mappings} with {Nested} {Queries}},
     journal = {Computer Science and Information Systems},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/CSIS_2013_10_1_a6/}
}