On the convergence of a lacunary trigonometrical series
Compositio Mathematica, Tome 15 (1962-1964), pp. 28-33. 
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     author = {Hsiang, Fu Cheng},
     title = {On the convergence of a lacunary trigonometrical series},
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     pages = {28--33},
     publisher = {Kraus Reprint},
     volume = {15},
     year = {1962-1964},
     mrnumber = {154045},
     zbl = {0108.06101},
     language = {en},
     url = {http://www.numdam.org/item/CM_1962-1964__15__28_0/}
}
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Hsiang, Fu Cheng. On the convergence of a lacunary trigonometrical series. Compositio Mathematica, Tome 15 (1962-1964), pp. 28-33. http://www.numdam.org/item/CM_1962-1964__15__28_0/

A. Kolmogoroff [1] Une contribution à l'étude de la convergence des séries de Fourier, Fund. Math., 5 (1924), 96-97. | JFM

J. Marcinkiewicz [2] A new proof of a theorem of Fourier series, Journ. London Math. Soc., 8 (1933), 279. | JFM | Zbl

A. Zygmund [8] Trigonometrical Series, Warsaw (1985). | JFM | Zbl