TY  - JOUR
AU  - V. T. Shevaldin
TI  - Lower estimations of widths some classes of periodic functions
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1992
SP  - 242
EP  - 267
VL  - 198
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TM_1992_198_a13/
LA  - ru
ID  - TM_1992_198_a13
ER  -