Patrick Mäder Orlena Gotel Ilka Philippow Enabling Automated Traceability Maintenance through the Upkeep of Traceability Relations. 174-189 2009 ECMDA-FA http://dx.doi.org/10.1007/978-3-642-02674-4_13 conf/ecmdafa/2009 db/conf/ecmdafa/ecmdafa2009.html#MaderGP09