TY  - JOUR
AU  - A. G. Babenko
TI  - An exact Jackson--Stechkin inequality for $L^2$-approximation on the interval with the Jacobi weight and on projective spaces
JO  - Izvestiya. Mathematics 
PY  - 1998
SP  - 1095
EP  - 1119
VL  - 62
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1998_62_6_a1/
LA  - en
ID  - IM2_1998_62_6_a1
ER  -