1. Logic of norms and logic of normative propositions;Alchourrón;Logique et Analyse,1969
2. Normative Systems;Alchourrón,1971
3. The expressive conception of norms;Alchourrón,1981
4. Von Wright on deontic logic and the philosophy of law;Alchourrón,1989
5. Entailment: The Logic of Relevance and Necessity, vol. 1;Anderson,1975