López, Sandra M. “Belnap-Dunn Semantics for the Variants of BN4 and E4 Which Contain Routley and Meyer’s Logic B”. Logic and Logical Philosophy 31, no. 1 (March 12, 2021): 29–56. Accessed June 23, 2024. https://apcz.umk.pl/LLP/article/view/29336.