@article{usingadronesoundertomeasurechannelsfor,
  title = {Using a Drone Sounder to Measure Channels for Cell-Free Massive MIMO Systems},
  author = {Thomas Choi and Jorge Gomez-Ponce and Colton Bullard and Issei Kanno and Masaaki Ito and Takeo Ohseki and Kosuke Yamazaki and Andreas F. Molisch},
  year = {2021},
  eprint = {2106.15276},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2106.15276v2},
}