@phdthesis{THESE_1931__126__1_0, author = {Durand, Georges}, title = {Sur une g\'en\'eralisation des surfaces convexes}, series = {Th\`eses de l'entre-deux-guerres}, number = {126}, year = {1931}, language = {fr}, url = {http://archive.numdam.org/item/THESE_1931__126__1_0/} }