Ciarán Cawley Steffen Thiel Goetz Botterweck Daren Nestor Visualising Inter-Model Relationships in Software Product Lines. 37-44 2009 VaMoS http://www.vamos-workshop.net/proceedings/VaMoS_2009_Proceedings.pdf conf/vamos/2009 db/conf/vamos/vamos2009.html#CawleyTBN09