Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1981__22_4_a4, author = {Sochor, Anton{\'\i}n and Vop\v{e}nka, Petr}, title = {Ultrafilters of sets}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {689--699}, publisher = {mathdoc}, volume = {22}, number = {4}, year = {1981}, mrnumber = {647017}, zbl = {0493.03028}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1981__22_4_a4/} }
Sochor, Antonín; Vopěnka, Petr. Ultrafilters of sets. Commentationes Mathematicae Universitatis Carolinae, Tome 22 (1981) no. 4, pp. 689-699. http://geodesic.mathdoc.fr/item/CMUC_1981__22_4_a4/