Piazza, Mario, Gabriele Pulcini, and Matteo Tesi. “Fractional-Valued Modal Logic and Soft Bilateralism”. Bulletin of the Section of Logic 52, no. 3 (August 16, 2023): 275–299. Accessed May 18, 2024. https://czasopisma.uni.lodz.pl/bulletin/article/view/14211.