@article{IM_1983__74_143062,
     author = {E.M. Stein},
     title = {Boundary {Behavior} of {Harmonic} {Functions} on {Symmetric} {Spaces:} {Maximal} {Estimates} for {Poisson} {Integrals.}},
     journal = {Inventiones mathematicae},
     pages = {63--84},
     publisher = {mathdoc},
     volume = {74},
     year = {1983},
     zbl = {0522.43007},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__74_143062/}
}