1. Åqvist, L.: Deontic logic. In: Gabbay, D.M., Guenthner, F. (eds.) Handbook of Philosophical Logic, 2nd edn, vol. 8, pp. 147–264. Kluwer, Dordrecht (2002)
2. Goble, L.: Dilemmas in deontic logic (to appear)
3. Goble, L.: A proposal for dealing with deontic dilemmas. In: Lomuscio, A., Nute, D. (eds.) DEON. Lecture Notes in Computer Science, vol. 3065, pp. 74–113. Springer, Heidelberg (2004)
4. Chisholm, R.M.: Contrary-to-duty imperatives and deontic logic. Analysis 24, 33–36 (1963)
5. Gabbay, D.M.: Completeness theorems for reactive modal logics (2010). Paper 392, July 2010. To appear in special issue of AMAI 2012