TY  - BOOK
AU  - Gardner,Martin
TI  - Aha! Aha! insight
SN  - 0894540017
AV  - QA95 G23. 1978 
PY  - 1978///
CY  - New York
PB  - Scientific American
KW  - Mathematical recreations
KW  - Puzzles
KW  - Problem solving
ER  -