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.
Joanna Jedrzejowicz. Undecidable Problems Associated with Combinatiorial Systems and Their One-One Degrees of Unsolvability. Math. Log. Q., 27(25-30):453-462, 1981. [doi]
Abstract is missing.