no. 4
On the geometric means of an integral function
Compositio Mathematica, Tome 19 (1968) no. 4, pp. 271-277. 
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     author = {Kumar, Kuldip},
     title = {On the geometric means of an integral function},
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     pages = {271--277},
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     volume = {19},
     number = {4},
     year = {1968},
     mrnumber = {245796},
     zbl = {0167.06101},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1968__19_4_271_0/}
}
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Kumar, Kuldip. On the geometric means of an integral function. Compositio Mathematica, Tome 19 (1968) no. 4, pp. 271-277. http://archive.numdam.org/item/CM_1968__19_4_271_0/

G.H. Hardy and W.W. Rogosinski [1] 'Note on Fourier Series (III)', Quarterly Journal of Mathematics, 16, (1945), pp. 49-58. | MR | Zbl

R.P. Boad, Jr. [2] 'Entire Functions', New York, 1954. | Zbl