@phdthesis{THESE_1922__33__1_0,
     author = {Bertrand, Gaston},
     title = {La th\'eorie des mar\'ees et les \'equations int\'egrales},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {33},
     year = {1922},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1922__33__1_0/}
}