@phdthesis{THESE_1934__157__1_0,
     author = {Barbier, D.},
     title = {Les \'etoiles doubles \`a longue p\'eriode. {Propri\'et\'es} statistiques et valeurs hypoth\'etiques de leurs \'el\'ements},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {157},
     year = {1934},
     language = {fr},
     url = {http://archive.numdam.org/item/THESE_1934__157__1_0/}
}