TY  - RPRT
TI  - Maximal functions: Poisson integrals on symmetric spaces.
AU  - E M Stein
PY  - 1976
DO  - 10.1073/pnas.73.8.2547
UR  - https://pubmed.ncbi.nlm.nih.gov/16592338/
ID  - 16592338
ER  -