@phdthesis{THESE_1939__226__1_0,
     author = {Lichnerowicz, Andr\'e},
     title = {Sur certains probl\`emes globaux relatifs au syst\`eme des \'equations {d'Einstein}},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {226},
     year = {1939},
     zbl = {0061.47001},
     language = {fr},
     url = {http://archive.numdam.org/item/THESE_1939__226__1_0/}
}