TY  - JOUR
AU  - Matyska, Jiří
TI  - Approximate differential and Federer normal
JO  - Czechoslovak Mathematical Journal
PY  - 1967
SP  - 97
EP  - 107
VL  - 17
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1967.100764/
DO  - 10.21136/CMJ.1967.100764
LA  - en
ID  - 10_21136_CMJ_1967_100764
ER  -