Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: keyword exact "Fitch–style natural deduction" Add to list Journal Article A1 Fitch-style natural deduction for modal paralogics Hans Lycke (UGent) (2009) Logique et Analyse. 207. p.193-218