@article{GDZPPN00222089X,
title = {\"Uber Tangentialk\"orper der Kugel.},
journal = {Manuscripta mathematica},
volume = {22},
year = {1977},
pages = {269-278},
zbl = {0383.52004},
url = {http://dml.mathdoc.fr/item/GDZPPN00222089X}
}
Schneider, Rolf. Über Tangentialkörper der Kugel.. Manuscripta mathematica, Tome 22 (1977) pp. 269-278. http://gdmltest.u-ga.fr/item/GDZPPN00222089X/