The q-analogue of Hölder’s theorem for the gamma function
Rendiconti del Seminario Matematico della Università di Padova, Tome 70 (1983), pp. 47-53. 
@article{RSMUP_1983__70__47_0,
     author = {Pastro, P. I.},
     title = {The $q$-analogue of {H\"older{\textquoteright}s} theorem for the gamma function},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {47--53},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {70},
     year = {1983},
     mrnumber = {742109},
     zbl = {0545.33004},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1983__70__47_0/}
}
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Pastro, P. I. The $q$-analogue of Hölder’s theorem for the gamma function. Rendiconti del Seminario Matematico della Università di Padova, Tome 70 (1983), pp. 47-53. http://www.numdam.org/item/RSMUP_1983__70__47_0/

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[4] Campbell, Les Integrales Euleriannes, Dunod.

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