TY  - BOOK
AU  - Giblin,Peter
AU  - Porteous,Ian
TI  - Challenging mathematics: a selection of secondary school mathematics problems ; edited by Peter Giblin and Ian Porteous
SN  - 0199143617
U1  - 510.76 23
PY  - 1990///.
CY  - Oxford: 
PB  - Oxford University Press, 
KW  - Mathematics
KW  - Problems, exercises, etc
ER  -