Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1985__21_3_a5, author = {Kar\'asek, Ji\v{r}{\'\i}}, title = {A remark concerning $x$-systems}, journal = {Archivum mathematicum}, pages = {177--179}, publisher = {mathdoc}, volume = {21}, number = {3}, year = {1985}, mrnumber = {833128}, zbl = {0594.20061}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1985__21_3_a5/} }
Karásek, Jiří. A remark concerning $x$-systems. Archivum mathematicum, Tome 21 (1985) no. 3, pp. 177-179. http://geodesic.mathdoc.fr/item/ARM_1985__21_3_a5/