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@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/} }
Eduardo Casas. On the singularities of Polar curves.. Manuscripta mathematica, Tome 43 (1983), pp. 167-190. http://geodesic.mathdoc.fr/item/MM2_1983__43_154949/