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Lparse (ps), su tcs.hut.fi, Aalto-yliopisto - Laboratory of Theoretical Computer Science. URL consultato il 4 aprile 2016 (archiviato il 20 marzo 2016). (PostScript)
Lparse (ps), su tcs.hut.fi, Aalto-yliopisto - Laboratory of Theoretical Computer Science. URL consultato il 4 aprile 2016 (archiviato il 20 marzo 2016). (PostScript)