CYC: Using Common Sense Knowledge to Overcome Brittleness and Knowledge Acquisition Bottlenecks. - Douglas B. Lenat; Mayank Prakash; Mary Shepherd (AI Mag., 1986)

CYC: Toward Programs With Common Sense. - Douglas B. Lenat; Ramanathan V. Guha; Karen Pittman; Dexter Pratt; Mary Shepherd (Commun. ACM, 1990)