Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Donald Perlis. Languages with Self-Reference II: Knowledge, Belief, and Modality. Artificial Intelligence, 34(2):179-212, 1988.
Abstract is missing.