no. 3
Über Favardklassen von Summationsprozessen mehrdimensionaler Fourierreihen
Compositio Mathematica, Tome 19 (1968) no. 3, pp. 196-212. 
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     volume = {19},
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     year = {1968},
     mrnumber = {230015},
     zbl = {0176.35501},
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Nessel, R. J.; Pawelke, A. Über Favardklassen von Summationsprozessen mehrdimensionaler Fourierreihen. Compositio Mathematica, Tome 19 (1968) no. 3, pp. 196-212. http://archive.numdam.org/item/CM_1968__19_3_196_0/

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