1. Albuquerque, H., Přenosil, A., Rivieccio, U.: An algebraic view of super-Belnap logics. Stud. Logica 105, 1051–1086 (2017)
2. Anderson, A.R., Belnap, N.D.: Entailment: The Logic of Relevance and Necessity, vol. I. Princeton University Press, Princeton (1975)
3. Anderson, A.R., Belnap, N.D., Dunn, J.M.: Entailment: The Logic of Relevance and Necessity, vol. II. Princeton University Press, Princeton (1992)
4. Belnap, N.D.: A formal analysis of entailment. Technical report, U.S. Office of Naval Research, vol. 7. Group Psychology Branch, New Haven (1960)
5. Belnap, N.D.: A useful four-valued logic. In: Dunn, J.M., Epstein, G. (eds.) Modern Uses of Multiple-Valued Logic, pp. 8–37. D. Reidel Publishing Company, Dordrecht (1977)