@misc{karimi2014structural,
  title={Structural differences between open and direct communication in an online community},
  author={Fariba Karimi and Verónica C. Ramenzoni and Petter Holme},
  year={2014},
  eprint={1407.8041},
  archivePrefix={arXiv},
  primaryClass={cs.SI},
  doi={10.1016/j.physa.2014.07.037},
  url={https://arxiv.org/abs/1407.8041}
}