@article{MAN_1965__158_161273,
     author = {E.R. WILLARD},
     title = {Properties of {Projective} {Generators.}},
     journal = {Mathematische Annalen},
     pages = {352--364},
     publisher = {mathdoc},
     volume = {158},
     year = {1965},
     zbl = {0131.27303},
     url = {http://geodesic.mathdoc.fr/item/MAN_1965__158_161273/}
}