Hartmut Ehrig Claudia Ermel Falk Hüffner Rolf Niedermeier Olga Runge Confluence in Data Reduction: Bridging Graph Transformation and Kernelization. 193-202 2012 CiE http://dx.doi.org/10.1007/978-3-642-30870-3_19 conf/cie/2012 db/conf/cie/cie2012.html#EhrigEHNR12