TY  - BOOK
AU  - Shklarsky,D.O.
AU  - Chentzov,N.N.
AU  - Yaglom,I.M.
TI  - The USSR olympiad problem book: Selected problems and theorems of elementary mathematics 
T2  - Dover books on mathematics
SN  - 048627797
AV  - QA43  S55 1993
PY  - 1993///
CY  - New York
PB  - DOVER publications, inc.
KW  - Lemb
KW  - Matemáticas
KW  - Problemas, ejercicios, etc
ER  -