Calimeri, Francesco, Susanna Cozza, Giovambattista Ianni, and Nicola Leone. 2010. “Enhancing ASP by Functions: Decidable Classes and Implementation Techniques”. Proceedings of the AAAI Conference on Artificial Intelligence 24 (1):1666-70. https://doi.org/10.1609/aaai.v24i1.7702.