TY  - JOUR
AU  - V. A. Skvortsov
TI  - Approximate symmetric variation and the Lusin $N$-property
JO  - Izvestiya. Mathematics 
PY  - 1997
SP  - 831
EP  - 841
VL  - 61
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1997_61_4_a7/
LA  - en
ID  - IM2_1997_61_4_a7
ER  -