[] Mitä "vapaa" tarkoittaa? tai Mitä käsite Free Software tarkoittaa?. 12/02/02. Tekijänoikeudet © . http://www.dk.debian.org/intro/free. http://www.dk.debian.org/intro/free.
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[] . . Tekijänoikeudet © . http://www.desktoplinux.com/cgi-bin/survey/survey.cgi?view=results&id=10292001114910. .
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[Sobell 1991] A Practical Guide to Unix System V, 2nd Ed.. 1991. Tekijänoikeudet © 1991 Mark G. Sobell. . .
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