TY  - BOOK
AU  - Encyclopedia of Mathematics and its applications
AU  - Korneichuk, N. 
AU  - Ivanov, K.
TI  - Exact constants in approximation theory
T2  - Encyclopedia of Mathematics and its applications
U1  - 510.3 
PY  - 1991///
CY  - Cambridge
PB  - Cambridge University Press
N1  - "Translated from the Russian by K. Ivanov"
ER  -