Robles, Gemma, José M. Blanco, Sandra M. López, Jesús R. Paradela, and Marcos M. Recio. “Relational Semantics for the 4-Valued Relevant Logics BN4 and E4”. Logic and Logical Philosophy 25, no. 2 (April 25, 2016): 173–201. Accessed December 28, 2025. https://apcz.umk.pl/LLP/article/view/LLP.2016.006.