Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1977__23_154521, author = {Rolf Schneider}, title = {\"Uber {Tangentialk\"orper} der {Kugel.}}, journal = {Manuscripta mathematica}, pages = {269--278}, publisher = {mathdoc}, volume = {23}, year = {1977}, zbl = {0383.52004}, url = {http://geodesic.mathdoc.fr/item/MM2_1977__23_154521/} }
Rolf Schneider. Über Tangentialkörper der Kugel.. Manuscripta mathematica, Tome 23 (1977), pp. 269-278. http://geodesic.mathdoc.fr/item/MM2_1977__23_154521/