On a function, which is a special case of Meijer’s G-function
Compositio Mathematica, Tome 15 (1962-1964), pp. 34-63. 
@article{CM_1962-1964__15__34_0,
     author = {Boersma, J.},
     title = {On a function, which is a special case of {Meijer{\textquoteright}s} $G$-function},
     journal = {Compositio Mathematica},
     pages = {34--63},
     publisher = {Kraus Reprint},
     volume = {15},
     year = {1962-1964},
     zbl = {0100.06505},
     mrnumber = {132847},
     language = {en},
     url = {http://www.numdam.org/item/CM_1962-1964__15__34_0/}
}
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Boersma, J. On a function, which is a special case of Meijer’s $G$-function. Compositio Mathematica, Tome 15 (1962-1964), pp. 34-63. http://www.numdam.org/item/CM_1962-1964__15__34_0/