TY  - BOOK
AU  - Gardner, Martin
TI  - Penrose tiles to trapdoor ciphers and the return of Dr. Matrix
SN  - 9782883855218
U1  - 793.74 GAR 
CY  - Washington, D.C
PB  - Mathematical Association of America
KW  - Mathematical recreations
KW  - , and Penrose Tiles to Trapdoor Ciphers and the Return of Dr. Matrix
ER  -