@article{rajanen2011jitta,
  title={Introducing Usability Activities into Open Source Software 
Development Projects-Searching for a Suitable Approach},
  author={Rajanen, Mikko and Iivari, Netta and Anttila, Kaisa},
  journal={JITTA: Journal of Information Technology Theory and 
Application},
  volume={12},
  number={4},
  pages={5-26},
  year={2011},
  publisher={AIS},
}