Singularities of polar curves
Compositio Mathematica, Tome 89 (1993) no. 3, pp. 339-359. 
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     author = {Casas-Alvero, E.},
     title = {Singularities of polar curves},
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     pages = {339--359},
     publisher = {Kluwer Academic Publishers},
     volume = {89},
     number = {3},
     year = {1993},
     mrnumber = {1255701},
     zbl = {0806.14021},
     language = {en},
     url = {http://www.numdam.org/item/CM_1993__89_3_339_0/}
}
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Casas-Alvero, E. Singularities of polar curves. Compositio Mathematica, Tome 89 (1993) no. 3, pp. 339-359. http://www.numdam.org/item/CM_1993__89_3_339_0/

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