@incollection{MSMF_1979__59__131_0,
     author = {Revoy, Philippe},
     title = {Fibr\'e tangent \`a la sph\`ere alg\'ebrique},
     booktitle = {Colloque sur les formes quadratiques (Montpellier, 1977)},
     series = {Bulletin de la Soci\'et\'e math\'ematique de France. M\'emoire},
     pages = {131--135},
     year = {1979},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {59},
     doi = {10.24033/msmf.254},
     mrnumber = {83b:15019},
     zbl = {0416.15017},
     url = {https://www.numdam.org/articles/10.24033/msmf.254/}
}