TY  - JOUR
AU  - V. M. Tsodyks
TI  - On sets of points where the derivative is finite or infinite correspondingly
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 1174
EP  - 1176
VL  - 114
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a9/
LA  - ru
ID  - DAN_1957_114_6_a9
ER  -