Juergen Rilling Yonggang Zhang Wen Jun Meng René Witte Volker Haarslev Philippe Charland A Unified Ontology-Based Process Model for Software Maintenance and Comprehension. 56-65 2006 conf/models/2006w MoDELS Workshops http://dx.doi.org/10.1007/978-3-540-69489-2_8 db/conf/models/models2006w.html#RillingZMWHC06