Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS2_1956__4_165625, author = {BJABNI J\'ONSSON}, title = {Universal relational systems}, journal = {Mathematica Scandinavica}, pages = {193--208}, publisher = {mathdoc}, volume = {4}, year = {1956}, zbl = {0077.25302}, url = {http://geodesic.mathdoc.fr/item/MS2_1956__4_165625/} }
BJABNI JÓNSSON. Universal relational systems. Mathematica Scandinavica, Tome 4 (1956), pp. 193-208. http://geodesic.mathdoc.fr/item/MS2_1956__4_165625/