1. Logic of norms and logic of normative propositions;Alchourrón;Log. Anal.,1969
2. Philosophical foundations of deontic logic and the logic of defeasible conditionals;Alchourrón,1991
3. Normative Systems;Alchourrón,1971
4. The expressive conception of norms;Alchourrón,1981
5. Permission and permissive norms;Alchourrón,1984