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- Letter to the Patent Office From Professor Donald Knuth (1994) http://www.pluto.it/files/meeting1999/atti/no-patents/brevetti/docs/knuth_letter_en.html 48 comments
- Letter to the Patent Office from Professor Donald Knuth (circa 1994) http://www.pluto.it/files/meeting1999/atti/no-patents/brevetti/docs/knuth_letter_en.html 31 comments
- 1994 Letter to the Patent Office from Professor Donald Knuth. http://www.pluto.it/files/meeting1999/atti/no-patents/brevetti/docs/knuth_letter_en.html?mwh=1 144 comments programming
- Letter to the Patent Office from Professor Donald Knuth. Programming Freedom.N11.Feb95. http://www.pluto.it/files/meeting1999/atti/no-patents/brevetti/docs/knuth_letter_en.html 142 comments programming