@phdthesis{THESE_1937__186__1_0,
     author = {Fayet, Joseph},
     title = {Invariants de quelques \'equations diff\'erentielles et r\'eduction de celles-ci \`a des \'equations \`a coefficients constants},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {186},
     year = {1937},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1937__186__1_0/}
}