Germain Saval Jorge Pinna Puissant Patrick Heymans Tom Mens Some Challenges of Feature-based Merging of Class Diagrams. 127-136 2009 VaMoS http://www.vamos-workshop.net/proceedings/VaMoS_2009_Proceedings.pdf conf/vamos/2009 db/conf/vamos/vamos2009.html#SavalPHM09