Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1972__13_1_a7, author = {Bican, Ladislav}, title = {Projective purities}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {99--107}, publisher = {mathdoc}, volume = {13}, number = {1}, year = {1972}, mrnumber = {0314907}, zbl = {0238.16023}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1972__13_1_a7/} }
Bican, Ladislav. Projective purities. Commentationes Mathematicae Universitatis Carolinae, Tome 13 (1972) no. 1, pp. 99-107. http://geodesic.mathdoc.fr/item/CMUC_1972__13_1_a7/