Blanco, José Miguel. “EF4, EF4-M and EF4-Ł: A Companion to BN4 and Two Modal Four-Valued Systems Without Strong Łukasiewicz-Type Modal Paradoxes”. Logic and Logical Philosophy 31, no. 1 (August 14, 2021): 75–104. Accessed May 28, 2024. https://apcz.umk.pl/LLP/article/view/32704.