@article{MS2_1985__56_166932,
     author = {A. Hefez and G. Sacchiero},
     title = {The {Galois} group of the tangency problem for plane curves.},
     journal = {Mathematica Scandinavica},
     pages = {171--190},
     publisher = {mathdoc},
     volume = {56},
     year = {1985},
     zbl = {0566.14024},
     url = {http://geodesic.mathdoc.fr/item/MS2_1985__56_166932/}
}