Schumann, Andrew. “A Lattice for the Language of Aristotle’s Syllogistic and a Lattice for the Language of Vasiľév’s Syllogistic”. Logic and Logical Philosophy 15, no. 1 (March 26, 2006): 17–37. Accessed June 17, 2024. https://apcz.umk.pl/LLP/article/view/LLP.2006.002.