1. Ågotnes, T., Broersen, J., & Elgesem, D. (Eds.). (2012). Proceedings of the 11th international conference on deontic logic in computer science (DEON 2012). Berlin: Springer.
2. Alchourrón, C. (1969). Logic of norms and logic of normative propositions. Logique & Analyse, 12, 242–268.
3. Alchourrón, C., & Bulygin, E. (1971). Normative systems. Vienna, New York: Springer.
4. Alchourrón, C., & Bulygin, E. (1981). The expressive conception of norms. In R. Hilpinen (Ed.) (pp. 95–124).
5. Alchourrón, C. (1993). Philosophical foundations of deontic logic and the logic of defeasible conditionals: In Meyer & Wieringa (Eds.) (pp. 43–84).