@article{CMH_1936__9_138671,
     author = {Sophie Piccard},
     title = {Les substitutions qui sont des transform\'ees r\'eciproques.},
     journal = {Commentarii mathematici Helvetici},
     pages = {109--123},
     publisher = {mathdoc},
     volume = {9},
     year = {1936},
     zbl = {0015.39201},
     url = {http://geodesic.mathdoc.fr/item/CMH_1936__9_138671/}
}