@article{twotimescalechannelestimationfor,
  title = {Two-Timescale Channel Estimation for Reconfigurable Intelligent Surface Aided Wireless Communications},
  author = {Chen Hu and Linglong Dai},
  year = {2019},
  eprint = {1912.07990},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1912.07990v2},
}