@article{AFST_1996_6_5_4_661_0,
     author = {Gutierrez, Carlos and Gu{\'\i}\~nez, Victor},
     title = {Positive quadratic differential forms : linearization, finite determinacy and versal unfolding},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {661--690},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 5},
     number = {4},
     year = {1996},
     mrnumber = {1473078},
     zbl = {0882.58007},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1996_6_5_4_661_0/}
}