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.
Michael Benedikt, Bart Kuijpers, Christof Löding, Jan Van den Bussche, Thomas Wilke. A characterization of first-order topological properties of planar spatial data. Journal of the ACM, 53(2):273-305, 2006. [doi]