no. 1
Über die Konvergenz der (C,1)-Mittel von Fourier-Laguerre-Reihen
Compositio Mathematica, Tome 21 (1969) no. 1, pp. 81-101. 
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     author = {Ernst, Dieter},
     title = {\"Uber die {Konvergenz} der $(C, 1)${-Mittel} von {Fourier-Laguerre-Reihen}},
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     pages = {81--101},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {1},
     year = {1969},
     mrnumber = {241894},
     zbl = {0174.36001},
     language = {de},
     url = {http://archive.numdam.org/item/CM_1969__21_1_81_0/}
}
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Ernst, Dieter. Über die Konvergenz der $(C, 1)$-Mittel von Fourier-Laguerre-Reihen. Compositio Mathematica, Tome 21 (1969) no. 1, pp. 81-101. http://archive.numdam.org/item/CM_1969__21_1_81_0/

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