1. A panel on knowledge representation Proceedings;Bobrow,1977
2. An overview of KRL: A knowledge representation language;Bobrow;Cognitive Science,1977
3. Special issue on knowledge representation;Brachman;SIGART Newsletter,1980
4. Investigations in modal and tense logics with applications to problems in philosophy and linguitics;Gabbay;Reidel Synthese Library,1976
5. The logic of inexact concepts;Goguen;Synthese,1969