Madalina Croitoru Sebastian Rudolph Nic Wilson John Howse Olivier Corby Graph Structures for Knowledge Representation and Reasoning - Second International Workshop, GKR 2011, Barcelona, Spain, July 16, 2011. Revised Selected Papers 7205 2012 Springer Lecture Notes in Computer Science http://dx.doi.org/10.1007/978-3-642-29449-5 978-3-642-29448-8 GKR db/conf/gkr/gkr2012.html