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.
Hugues Leblanc, D. Paul Snyder. Duals of Smullyan trees. Notre Dame Journal of Formal Logic, 13(3):387-393, 1972. [doi]
Abstract is missing.