Are call detail records biased for sampling human mobility?

Gyan Ranjan, Hui Zang, Zhi-Li Zhang, Jean Bolot. Are call detail records biased for sampling human mobility?. Mobile Computing and Communications Review, 16(3):33-44, 2012. [doi]

@article{RanjanZZB12,
  title = {Are call detail records biased for sampling human mobility?},
  author = {Gyan Ranjan and Hui Zang and Zhi-Li Zhang and Jean Bolot},
  year = {2012},
  doi = {10.1145/2412096.2412101},
  url = {http://doi.acm.org/10.1145/2412096.2412101},
  researchr = {https://researchr.org/publication/RanjanZZB12},
  cites = {0},
  citedby = {0},
  journal = {Mobile Computing and Communications Review},
  volume = {16},
  number = {3},
  pages = {33-44},
}