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.
Vladimír Glasnák. Sparse Sets and Collapse of Complexity Classes. Inf. Comput., 170(1):26-48, 2001.
Abstract is missing.