@misc{kalantari2018number,
  title={On the Number and 3D Placement of Drone Base Stations in Wireless Cellular Networks},
  author={Elham Kalantari and Halim Yanikomeroglu and Abbas Yongacoglu},
  year={2018},
  eprint={1804.08415},
  archivePrefix={arXiv},
  primaryClass={cs.NI},
  url={https://arxiv.org/abs/1804.08415}
}