Carnielli, Walter A., and Marcelo E. Coniglio. “Twist-Valued Models for Three-Valued Paraconsistent Set Theory”. Logic and Logical Philosophy 30, no. 2 (May 4, 2021): 187–226. Accessed November 27, 2021. https://apcz.umk.pl/LLP/article/view/LLP.2020.015.