Computation of a Subclass of Inferences: Presupposition and Entailment Aravind K Joshi author Ralph Weischedel author 1977-02 text journal article American Journal of Computational Linguistics continuing periodical academic journal Microfiche 63 joshi-weischedel-1977-computation https://aclanthology.org/J77-1008/ 1977-02 1 54