@Article{RoettgerZschaler2007,
  author    = {Simone R{\"o}ttger and Steffen Zschaler},
  title     = {Tool Support for Refinement of Non-functional Specifications},
  journal   = {Software and Systems Modeling journal (SoSyM)},
  volume    = 6,
  number    = 2,
  month     = jun,
  year      = 2007,
  publisher = {Springer},
}