@inproceedings{ibrahim2016visible,
  title={Visible light based activity sensing using ceiling photosensors},
  author={Ibrahim, Mohamed and Nguyen, Viet and Rupavatharam, Siddharth and Jawahar, Minitha and Gruteser, Marco and Howard, Richard},
  booktitle={Proceedings of the 3rd Workshop on Visible Light Communication Systems},
  pages={43--48},
  year={2016},
  organization={ACM}
}