Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1980__16_3_a5, author = {Rach\r{u}nek, Ji\v{r}{\'\i}}, title = {Categories of systems of $X$-relations}, journal = {Archivum mathematicum}, pages = {175--184}, publisher = {mathdoc}, volume = {16}, number = {3}, year = {1980}, mrnumber = {594463}, zbl = {0447.18001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1980__16_3_a5/} }
Rachůnek, Jiří. Categories of systems of $X$-relations. Archivum mathematicum, Tome 16 (1980) no. 3, pp. 175-184. http://geodesic.mathdoc.fr/item/ARM_1980__16_3_a5/