@phdthesis{THESE_1935__171__1_0,
     author = {Adad, H.},
     title = {Recherches sur les surfaces plusieurs fois cercl\'ees},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {171},
     year = {1935},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1935__171__1_0/}
}