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.
Caterina Bianchini, Andrea Sorbi. A Note an Closed Degrees of Difculty of the Medvedev Lattice. Math. Log. Q., 42:127-133, 1996.
Abstract is missing.