On the Cesàro and Riesz means of Fourier series
Compositio Mathematica, Tome 7 (1940), pp. 112-122. 
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     author = {Sz\'asz, Otto},
     title = {On the {Ces\`aro} and {Riesz} means of {Fourier} series},
     journal = {Compositio Mathematica},
     pages = {112--122},
     publisher = {Johnson Reprint Corporation},
     volume = {7},
     year = {1940},
     zbl = {0021.22003},
     language = {en},
     url = {http://www.numdam.org/item/CM_1940__7__112_0/}
}
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Szász, Otto. On the Cesàro and Riesz means of Fourier series. Compositio Mathematica, Tome 7 (1940), pp. 112-122. http://www.numdam.org/item/CM_1940__7__112_0/

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7 A. Zygmund, Trigonometrical series [1935]. | JFM | Zbl