@phdthesis{THESE_1925__55__1_0,
     author = {Krebs, Henri},
     title = {Sur deux \'equations aux d\'eriv\'ees partielles},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {55},
     year = {1925},
     language = {fr},
     url = {http://archive.numdam.org/item/THESE_1925__55__1_0/}
}