da Costa, Newton C.A., and Roque da C. Caiero. “K-Transforms in Classical and Paraconsistent Logics”. Logic and Logical Philosophy 7, no. 7 (January 7, 2004): 63–80. Accessed July 5, 2024. https://apcz.umk.pl/LLP/article/view/LLP.1999.005.