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References
- ↑ Prawitz, Dag (1965). Natural deduction: A proof-theoretical study . Acta Universitatis Stockholmiensis, Stockholm studies in philosophy 3. Stockholm, Göteborg, Uppsala: Almqvist & Wicksell.
- ↑ Prawitz, Dag (2006) [1965]. Natural deduction: A proof-theoretical study. Mineola, New York: Dover Publications. ISBN 978-0-486-44655-4.
- ↑ "Gruppe 3: Idéfag" (in Norwegian). Norwegian Academy of Science and Letters. Archived from the original on 9 January 2015. Retrieved 16 January 2011.
