@phdthesis{THESE_1943__252__1_0,
     author = {L\'evy, Jacques},
     title = {Les approches dans le probl\`eme des trois corps},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {252},
     year = {1943},
     zbl = {0063.03526},
     language = {fr},
     url = {http://archive.numdam.org/item/THESE_1943__252__1_0/}
}