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@article{CM_1965-1966__17__281_0, author = {Hsiang, Fu Cheng}, title = {On an extension of a theorem of {O.} {Sz\`asz}}, journal = {Compositio Mathematica}, pages = {281--285}, publisher = {Kraus Reprint}, volume = {17}, year = {1965-1966}, mrnumber = {204975}, zbl = {0163.07803}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1965-1966__17__281_0/} }
Hsiang, Fu Cheng. On an extension of a theorem of O. Szàsz. Compositio Mathematica, Tome 17 (1965-1966), pp. 281-285. http://geodesic.mathdoc.fr/item/CM_1965-1966__17__281_0/