1. Alchourrón C (1993) Philosophical foundations of deontic logic and the logic of defeasible conditionals. In: Meyer, Wieringa (eds) Deontic logic in computer science: normative systems specification. Wiley, Chichester, pp 43–84
2. Alchourrón C (1996) On law and logic. Ratio Juris 9(4):331–348. Spanish version: Sobre derecho y lógica, Isonomía, 13, 2000
3. Alchourrón C, Bulygin E (1971) Normative systems. Springer, New York. Spanish version: Sistemas Normativos. Astrea. 2012
4. Bulygin E (2006) El positivismo jurídico. Fontamara, México
5. Bulygin E (2014) Prologue by Eugenio Bulygin. In: Navarro P, Rodríguez J (eds) Deontic logic and legal systems. Cambridge University Press, New York