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https://www.cys.cic.ipn.mx/index.php/CyS/article/view/3345/2766 Inferring Knowledge from Textual Data by Natural Deduction | Duží | Computación y Sistemas Inferring Knowledge from Textual Data by Natural Deduction textual data natural deduction inferring knowledge sistemas https://publikationen.uni-tuebingen.de/xmlui/handle/10900/68977 General Proof Theory. Celebrating 50 Years of Dag Prawitz's "Natural Deduction". Proceedings of the... proof theory dag prawitz natural deduction general celebrating https://forallx.openlogicproject.org/html/Ch18.html Chapter 18 Constructing proofs ‣ Part IV Natural deduction for TFL ‣ forall x: Calgary part iv natural deduction chapter constructing proofs