TY  - BOOK
AU  - Gardner,Martin
TI  - Aha! Aha! insight
SN  - 978-0716710172
AV  - QA95 .G23
U1  - 793.7/4 
PY  - 1978///
CY  - New York
PB  - W. H. Freeman And Company, 
KW  - Mathematical recreations
KW  - Puzzles
KW  - Problem solving
N1  - Bibliography: p. 171-173
ER  -