Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{AMLG_1960__5_137754, author = {Hugo Ribeiro}, title = {On the universal completeness of classes of relational systems.}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {90--95}, publisher = {mathdoc}, volume = {5}, year = {1960}, zbl = {0121.01204}, url = {http://geodesic.mathdoc.fr/item/AMLG_1960__5_137754/} }
Hugo Ribeiro. On the universal completeness of classes of relational systems.. Archiv für mathematische Logik und Grundlagenforschung, Tome 5 (1960), pp. 90-95. http://geodesic.mathdoc.fr/item/AMLG_1960__5_137754/