@article{reconfigurableintelligentsurfaces20,
  title = {Reconfigurable Intelligent Surfaces 2.0: Beyond Diagonal Phase Shift Matrices},
  author = {Hongyu Li and Shanpu Shen and Matteo Nerini and Bruno Clerckx},
  year = {2023},
  eprint = {2301.03288},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2301.03288v3},
}