Penrose Tiles to Trapdoor Ciphaers : And the Return of Dr. Matrix.
Gardner, Martin.
Penrose Tiles to Trapdoor Ciphaers : And the Return of Dr. Matrix. - Washington D.C. Mathematical Association of America. 1997
0883855216
Penrose Tiles to Trapdoor Ciphaers : And the Return of Dr. Matrix. - Washington D.C. Mathematical Association of America. 1997
0883855216