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.
Roderic A. Girle. Logics for knowledge, possibility, and existence. Notre Dame Journal of Formal Logic, 19(2):200-214, 1978. [doi]
Abstract is missing.