@article{02107642,
title = {The spread of the shape operator as conformal invariant.},
journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
volume = {4},
year = {2003},
zbl = {1055.53014},
language = {en},
url = {http://dml.mathdoc.fr/item/02107642}
}
Suceavă, Bogdan D. The spread of the shape operator as conformal invariant.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 4 (2003) . http://gdmltest.u-ga.fr/item/02107642/