On a theorem of Charles and Erdélyi
Bulletin de la Société Mathématique de France, Tome 89 (1961) , pp. 103-104. 
@article{BSMF_1961__89__103_0,
     author = {Khabbaz, Samir},
     title = {On a theorem of Charles and Erd\'elyi},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {103--104},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {89},
     year = {1961},
     doi = {10.24033/bsmf.1561},
     zbl = {0099.01203},
     mrnumber = {26 \#5055},
     language = {en},
     url = {www.numdam.org/item/BSMF_1961__89__103_0/}
}
Khabbaz, Samir. On a theorem of Charles and Erdélyi. Bulletin de la Société Mathématique de France, Tome 89 (1961) , pp. 103-104. doi : 10.24033/bsmf.1561. http://www.numdam.org/item/BSMF_1961__89__103_0/

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