TY  - GEN
AU  - Holton, Derek 
TI  - Second step to mathematical olympiad problems 
T2  - Mathematical olympiad series; vol.7
SN  - 9789814327879
PY  - 2011///
CY  - Singapore
PB  - World Scientific Publishing
KW  - Mathematical olympiad - mathematics competitions - Guide
KW  - Combinatorics - Geometry and number theory
ER  -