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.
Herbert B. Enderton, Hilary Putnam. A Note on the Hyperarithmetical Hierarchy. Journal of Symbolic Logic, 35(3):429-430, 1970.
Abstract is missing.