@phdthesis{THESE_1926__67__3_0,
     author = {Long, Louis},
     title = {Sur certaines transformations par polaires r\'eciproques relativement au complexe lin\'eaire et \`a la sph\`ere},
     series = {Th\`eses de l'entre-deux-guerres},
     number = {67},
     year = {1926},
     language = {fr},
     url = {http://www.numdam.org/item/THESE_1926__67__3_0/}
}