References
Lorenzo Peña
with Ausín, T. (2012)., Soft deontic logic, in R. Seising & V. Sanz González (eds.), Soft computing in humanities and social sciences, Dordrecht, Springer, pp. 157-172.
(1990). Partial truth, fringes, and motion: three applications of a contradictorial logic. Studies in East European Thought 39 (3-4), pp. 283-312.