1. Almukdad, A., & Nelson, D. (1984). Constructible falsity and inexact predicates. Journal of Symbolic Logic, 49, 231–33.
2. Anderson, A.R., & Belnap, N.D. Jr. (1962). Tautological entailments. Philosophical Studies, 13, 9–24.
3. Anderson, A.R., & Belnap, N.D. Jr. (1975). Entailment: the logic of relevance and necessity Vol. 1. Princeton: Princeton University Press.
4. Anderson, A.R., Belnap, N.D. Jr., Dunn, J.M. (1992). Entailment: the logic of relevance and necessity Vol. 2. Princeton: Princeton University Press.
5. Angell, R.B. (1977). Three systems of first degree entailment. The Journal of Symbolic Logic, 42, 147.