@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://www.numdam.org/item/CM_1965-1966__17__281_0/}
}