TY  - BOOK
AU  - Gratzer,George A.
TI  - Train your brain: a year’s worth of puzzles 
SN  - 9781568817101
PY  - 2011///
CY  - Boca Raton, FL
PB  - CRC Press
KW  - Word games
KW  - Word problems (Mathematics)
N1  - Translated from the German
ER  -