TY  - JOUR
AU  - E. A. Sevast'yanov
TI  - On~an~estimate for the smallness of sets of points of nondifferentiability of functions as related to the degree of approximation by rational functions
JO  - Izvestiya. Mathematics 
PY  - 1986
SP  - 347
EP  - 369
VL  - 26
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1986_26_2_a5/
LA  - en
ID  - IM2_1986_26_2_a5
ER  -