@article{doublerisversussinglerisaidedsystems,
  title = {Double-RIS Versus Single-RIS Aided Systems: Tensor-Based MIMO Channel Estimation and Design Perspectives},
  author = {Khaled Ardah and Sepideh Gherekhloo and André L. F. de Almeida and Martin Haardt},
  year = {2021},
  eprint = {2109.09099},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.09099v1},
}