@article{GDZPPN002330024,
title = {Tautness and Lie Sphere Geometry.},
journal = {Mathematische Annalen},
volume = {277},
year = {1987},
pages = {381-400},
zbl = {0635.53029},
url = {http://dml.mathdoc.fr/item/GDZPPN002330024}
}
Cecil, Thomas E.; Chern, Shiing-Shen. Tautness and Lie Sphere Geometry.. Mathematische Annalen, Tome 277 (1987) pp. 381-400. http://gdmltest.u-ga.fr/item/GDZPPN002330024/