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.
Hajo Broersma, Zdenek Ryjácek, Ingo Schiermeyer. Closure Concepts: A Survey. Graphs and Combinatorics, 16(1):17-48, 2000. [doi]