@article{wang2026sparse,
  title={Sparse Activation for Sustainable Cell-Free Massive {MIMO} Networks: Less is More},
  author={DZhe Wang and Shuaifei Chen and Emil Bj{\"o}rnson},
  year={2026, \emph{arXiv:2606.03912}. [Online]. Available: https://arxiv.org/abs/2606.03912}
}