@phdthesis{THESE_1939__225__R1_0,
     author = {Cagniard, L.},
     title = {R\'eflexion et r\'efraction des ondes s\'eismiques progressives},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {225},
     year = {1939},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1939__225__R1_0/}
}