@inproceedings{KnieselNMB02,
  title = {Unanticipated Software Evolution},
  author = {Günter Kniesel and Joost Noppen and Tom Mens and Jim Buckley},
  year = {2002},
  url = {http://link.springer.de/link/service/series/0558/bibs/2548/25480092.htm},
  tags = {software evolution},
  researchr = {https://researchr.org/publication/KnieselNMB02},
  cites = {0},
  citedby = {0},
  pages = {92-106},
  booktitle = {ECOOPW},
}

@inproceedings{NoppenBWR09,
  title = {Modelling Imperfect Product Line Requirements with Fuzzy Feature Diagrams},
  author = {Joost Noppen and Pim van den Broek and Nathan Weston and Awais Rashid},
  year = {2009},
  url = {http://www.vamos-workshop.net/proceedings/VaMoS_2009_Proceedings.pdf},
  tags = {feature diagrams, product line},
  researchr = {https://researchr.org/publication/NoppenBWR09},
  cites = {0},
  citedby = {0},
  pages = {93-102},
  booktitle = {vamos},
}