@inproceedings{houben2013activity,
  title={Activity-centric support for ad hoc knowledge work: a case study of co-activity manager},
  author={Houben, Steven and Bardram, Jakob E and Vermeulen, Jo and Luyten, Kris and Coninx, Karin},
  booktitle={Proceedings of the SIGCHI Conference on Human Factors in Computing Systems},
  pages={2263--2272},
  year={2013},
  organization={ACM}
}