W. H. Freeman & Company, New York 1988
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| Gardner, Martin: | |
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Time Travel and Other Mathematical Bewilderments W. H. Freeman & Company, New York 1988 |
| Gardner, Martin: | |
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Penrose Tiles to Trapdoor Ciphers nnnn |
| Stand: 28.10.2002 / hp@hp-gramatke.de |
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