@phdthesis{THESE_1943__255__1_0,
     author = {Costa de Beauregard, Olivier},
     title = {Contribution \`a l'\'etude de la th\'eorie de l'\'electron de {Dirac}},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {255},
     year = {1943},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1943__255__1_0/}
}