TY  - BOOK
AU  - Zhang,Yao
TI  - Combinatorial problems in mathematical competitions
T2  - Mathematical Oympiad series
SN  - 9789812839497 (pbk.)
PY  - 2011///
CY  - Singapore
PB  - World Scientific
KW  - Combinatorial analysis
KW  - Problems, exercises, etc
ER  -