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

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