On summability of Fourier series by the repeated de la Vallée Poussin sums
1938 ◽
Vol 44
(10)
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pp. 733-737
1989 ◽
Vol 41
(6)
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pp. 694-699
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1931 ◽
Vol os-2
(1)
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pp. 207-229
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1970 ◽
Vol 30
(2)
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pp. 308-312
1980 ◽
Vol s3-41
(2)
◽
pp. 217-253
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1994 ◽
Vol 104
(2)
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