@article{PDML_1967__4_2_A3_0,
     author = {Ertel, G.},
     title = {Une partition du groupe des homographies bilat\`eres de la droite projective, dans une alg\`ebre de quaternions g\'en\'eralis\'es},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {75--144},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     volume = {4},
     number = {2},
     year = {1967},
     mrnumber = {231267},
     zbl = {0156.40803},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1967__4_2_A3_0/}
}