TY  - BOOK
AU  - Engel,A
TI  - Problem solving strategies
T2  - Problem books in mathematics
SN  - 81-8128-015-6
U1  - 1+2+3 
PY  - 2005///
CY  - New Delhi
PB  - Springer (India) Pvt. Ltd
N1  - SIE
ER  -