@article{GDZPPN002294311, title = {Properties of Projective Generators.}, journal = {Mathematische Annalen}, volume = {161}, year = {1965}, pages = {352-364}, zbl = {0131.27303}, url = {http://dml.mathdoc.fr/item/GDZPPN002294311} }
WILLARD, E.R. Properties of Projective Generators.. Mathematische Annalen, Tome 161 (1965) pp. 352-364. http://gdmltest.u-ga.fr/item/GDZPPN002294311/