Reachability, which indicates whether a person is reachable from another person through a
sequence of location-based contacts, is of importance in many domains, such as public …

Reachability preserving compression generates small graphs that preserve the information
only relevant to reachability queries, and the compressed graph can answer any reachability …

With the rapid development of location sensors, it is now possible to accurately study how
various items (such as viruses or messages) spread across populations of moving objects …