Sotirios Liaskos Lei Jiang Alexei Lapouchnian Yiqiao Wang Yijun Yu Julio Cesar Sampaio do Prado Leite John Mylopoulos Exploring the Dimensions of Variability: a Requirements Engineering Perspective. 17-26 2007 VaMoS http://www.vamos-workshop.net/proceedings/VaMoS_2007_Proceedings.pdf conf/vamos/2007 db/conf/vamos/vamos2007.html#LiaskosJLWYLM07