Integral functions of two complex variables
Compositio Mathematica, Tome 15 (1962-1964), pp. 210-226. 
@article{CM_1962-1964__15__210_0,
     author = {Bose, S. K. and Sharma, Devendra},
     title = {Integral functions of two complex variables},
     journal = {Compositio Mathematica},
     pages = {210--226},
     publisher = {Kraus Reprint},
     volume = {15},
     year = {1962-1964},
     mrnumber = {162966},
     zbl = {0116.06101},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1962-1964__15__210_0/}
}
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Bose, S. K.; Sharma, Devendra. Integral functions of two complex variables. Compositio Mathematica, Tome 15 (1962-1964), pp. 210-226. http://archive.numdam.org/item/CM_1962-1964__15__210_0/

G. Valiron, [1] Theory of Integral Functions (1923). | JFM