no. 1
Entire methods of summation
Compositio Mathematica, Tome 21 (1969) no. 1, pp. 35-42. 
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     number = {1},
     year = {1969},
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     zbl = {0172.33802},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1969__21_1_35_0/}
}
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Brown, H. I. Entire methods of summation. Compositio Mathematica, Tome 21 (1969) no. 1, pp. 35-42. http://archive.numdam.org/item/CM_1969__21_1_35_0/

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M.S. Macphail [3] Some Theorems on Absolute Summability, Can. J. Math. 3 (1951), 386-390. | MR | Zbl

A. Wilansky [4] Functional Analysis, Blaisdell, New York, 1964. | MR | Zbl