Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1983__33_3_a2, author = {Michel, Horst}, title = {Generation of operation-invariant classes of sets}, journal = {Mathematica slovaca}, pages = {257--268}, publisher = {mathdoc}, volume = {33}, number = {3}, year = {1983}, mrnumber = {713949}, zbl = {0551.28002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1983__33_3_a2/} }
Michel, Horst. Generation of operation-invariant classes of sets. Mathematica slovaca, Tome 33 (1983) no. 3, pp. 257-268. http://geodesic.mathdoc.fr/item/MASLO_1983__33_3_a2/