@article{MOMA_1983__96_178154,
     author = {Per Sj\"olin},
     title = {Regularity and {Integrability} of {Spherical} {Means.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {277--292},
     publisher = {mathdoc},
     volume = {96},
     year = {1983},
     zbl = {0519.42018},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1983__96_178154/}
}