@phdthesis{THESE_1925__53__1_0,
     author = {Risser, R.},
     title = {Essai sur la th\'eorie des ondes par \'emersion},
     series = {Th\`eses de l'entre-deux-guerres},
     type = {Doctorat d'\'Etat},
     number = {53},
     year = {1925},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1925__53__1_0}
}