TY  - JOUR
AU  - Yu. A. Brudnyi
TI  - Criteria for the existence of derivatives in $L^p$
JO  - Sbornik. Mathematics
PY  - 1967
SP  - 35
EP  - 55
VL  - 2
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1967_2_1_a3/
LA  - en
ID  - SM_1967_2_1_a3
ER  -