@article{PMIHES_1974__43__5_0,
     author = {Sotomayor, Jorge},
     title = {Generic one-parameter families of vector fields on two-dimensional manifolds},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--46},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {43},
     year = {1974},
     mrnumber = {339279},
     zbl = {0279.58008},
     language = {en},
     url = {http://archive.numdam.org/item/PMIHES_1974__43__5_0/}
}