TY  - JOUR
AU  - Broglia, F.
AU  - Tognoli, A.
TI  - Approximation of $C^\infty $-functions without changing their zero-set
JO  - Annales de l'Institut Fourier
PY  - 1989
SP  - 611
EP  - 632
VL  - 39
IS  - 3
PB  - Institut Fourier
PP  - Grenoble
UR  - http://www.numdam.org/articles/10.5802/aif.1178/
DO  - 10.5802/aif.1178
LA  - en
ID  - AIF_1989__39_3_611_0
ER  -