@article{MM2_1983__43_154949,
     author = {Eduardo Casas},
     title = {On the singularities of {Polar} curves.},
     journal = {Manuscripta mathematica},
     pages = {167--190},
     publisher = {mathdoc},
     volume = {43},
     year = {1983},
     zbl = {0526.14015},
     url = {http://geodesic.mathdoc.fr/item/MM2_1983__43_154949/}
}