1. Philosophical Foundations of Deontic Logic and the Logic of Defeasible Conditionals;Alchourron,1993
2. Detachment and Defeasibility in Deontic Logic;Alchourron;Studia Logica,1996
3. Normative Systems;Alchourron,1971
4. The Expressive Conception of Norms;Alchourron,1981
5. Hierarchies of Regulations and Their Logic;Alchourron,1981