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.
Walter S. Brainerd, Ronald B. Knode. Some Criteria for Determining Recognizability of a Set. Inf. Comput., 21(2):171-184, September 1972.
Abstract is missing.