@inproceedings{LiJA.12,
  author    = {Sotirios Liaskos and
               Rina Jalman and
               Jorge Aranda},
  title     = {On eliciting contribution measures in goal models},
  booktitle = {Proceedings of the 20th IEEE International Requirements Engineering Conference (RE'12)},
  address = {Chicago, IL},
  year      = {2012},
  pages     = {221-230},
}