TY  - JOUR
AU  - I. F. Sharygin
TI  - A~lower bound for the error of a~formula for approximate summation in the class $E_{s,p}(C)$
JO  - Matematičeskie zametki
PY  - 1977
SP  - 371
EP  - 375
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a8/
LA  - ru
ID  - MZM_1977_21_3_a8
ER  -