On the mean values of integral functions and their derivatives represented by Dirichlet series
Compositio Mathematica, Tome 19 (1968) no. 4, pp. 334-340. 
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     author = {Srivastava, Satya Narain},
     title = {On the mean values of integral functions and their derivatives represented by {Dirichlet} series},
     journal = {Compositio Mathematica},
     pages = {334--340},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {19},
     number = {4},
     year = {1968},
     mrnumber = {245801},
     zbl = {0167.35605},
     language = {en},
     url = {http://www.numdam.org/item/CM_1968__19_4_334_0/}
}
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Srivastava, Satya Narain. On the mean values of integral functions and their derivatives represented by Dirichlet series. Compositio Mathematica, Tome 19 (1968) no. 4, pp. 334-340. http://www.numdam.org/item/CM_1968__19_4_334_0/

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P.K. Kamthan [2] On the mean values of an entire function represented by Dirichlet series, Acta Mathematica Tomus XV (1964), pp. 133-136. | MR | Zbl

E.C. Titchmarsh [3] Theory of Functions, (1939). | JFM