@article{GDZPPN002227622, title = {On the total absolute curvature of closed curves in spheres.}, journal = {Manuscripta mathematica}, volume = {55}, year = {1986}, pages = {101-108}, zbl = {0589.53001}, url = {http://dml.mathdoc.fr/item/GDZPPN002227622} }
Teufel, Eberhard. On the total absolute curvature of closed curves in spheres.. Manuscripta mathematica, Tome 55 (1986) pp. 101-108. http://gdmltest.u-ga.fr/item/GDZPPN002227622/