@article{sumformeruniversalapproximationfor,
  title = {Sumformer: Universal Approximation for Efficient Transformers},
  author = {Silas Alberti and Niclas Dern and Laura Thesing and Gitta Kutyniok},
  year = {2023},
  eprint = {2307.02301},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2307.02301v1},
}