@article{AFST_1998_6_7_1_87_0,
     author = {Lion, Jean-Marie},
     title = {Densit\'e des ensembles semi-pfaffiens},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {87--92},
     publisher = {Universit\'e Paul Sabatier. Facult\'e des sciences},
     address = {Toulouse},
     volume = {6e s{\'e}rie, 7},
     number = {1},
     year = {1998},
     mrnumber = {1658448},
     zbl = {0917.32003},
     language = {fr},
     url = {http://www.numdam.org/item/AFST_1998_6_7_1_87_0/}
}