@misc{indiciae1e411c24766a,
  title = {Maximal functions: Poisson integrals on symmetric spaces.},
  author = {E M Stein},
  year = {1976},
  doi = {10.1073/pnas.73.8.2547},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592338/},
  note = {Source identifier: 16592338}
}