no. 1
Sur l'approximation des hypersurfaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 25 (1971) no. 1, pp. 47-58. 
@article{ASNSP_1971_3_25_1_47_0,
     author = {Hirschowitz, Andr\'e},
     title = {Sur l'approximation des hypersurfaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {47--58},
     publisher = {Scuola normale superiore},
     volume = {3e s{\'e}rie, 25},
     number = {1},
     year = {1971},
     zbl = {0208.35105},
     mrnumber = {301229},
     language = {fr},
     url = {www.numdam.org/item/ASNSP_1971_3_25_1_47_0/}
}
Hirschowitz, Andrè. Sur l'approximation des hypersurfaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 25 (1971) no. 1, pp. 47-58. http://www.numdam.org/item/ASNSP_1971_3_25_1_47_0/

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