@phdthesis{THESE_1915__7__1_0,
     author = {P\'er\`es, Joseph},
     title = {Sur les fonctions permutables de premi\`ere esp\`ece de {M.} {Vito} {Volterra}},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {7},
     year = {1915},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1915__7__1_0/}
}