@article{MAN_1990__287_1_164696,
     author = {E. Casas-Alvero},
     title = {Infinitely near imposed singularities and singularities of polar curves.},
     journal = {Mathematische Annalen},
     pages = {429--454},
     publisher = {mathdoc},
     volume = {287},
     number = {1},
     year = {1990},
     zbl = {0675.14009},
     url = {http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164696/}
}