TY  - BOOK
AU  - Nelsen, R.B.  .
TI  - Proofs without workds II more exercises in visual thinking / 
SN  - 0-88385-721-9
U1  - B 
PY  - 2000///
CY  - Washington : 
PB  - Mathematical Association of America , 
KW  - Mathematics
ER  -