TY  - BOOK
AU  - Gardner,Martin
TI  - Mathematical circus: more games, puzzles, paradoxes, & other mathematical entertainments from scientific american 
SN  - 0394502078
AV  - QA95 G36
PY  - 1979///
CY  - New York
PB  - Knopf
KW  - Matemáticas recreativas
ER  -