@article{IM_1977__41_142487,
     author = {M. Merle},
     title = {Invariants polaires de courbes planes.},
     journal = {Inventiones mathematicae},
     pages = {103--112},
     publisher = {mathdoc},
     volume = {41},
     year = {1977},
     zbl = {0371.14003},
     url = {http://geodesic.mathdoc.fr/item/IM_1977__41_142487/}
}