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.
Joseph Y. Halpern, Moshe Y. Vardi. The Complexity of Reasoning about Knowledge and Time. I. Lower Bounds. J. Comput. Syst. Sci., 38(1):195-237, 1989.
Abstract is missing.