1. Anderson, A. R., and N. D. Belnap, Jnr., ?Enthymemes?, The Journal of Philosophy 58 (1961), 713?723.
2. Anderson, A. R., and N. D. Belnap, Jnr., Entailment: The Logic of Relevance and Necessity, Volume 1, Princeton University Press, 1975.
3. Anderson, A. R., N. D. Belnap, Jnr., and J. M. Dunn, Entailment: The Logic of Relevance and Necessity, Volume 2, Princeton University Press, 1992.
4. Avron, A., ?Relevant entailment?semantics and the formal systems?, The Journal of Symbolic Logic 49 (1984), 334?432.
5. Avron, A., ?On an implication connective of RM?, Notre Dame Journal of Formal Logic 27 (1986), 201?209.