@article{05029610,
title = {Regular homotopy and total curvature. II: Sphere immersions into 3-space.},
journal = {Geometry \& Topology},
volume = {6},
year = {2006},
pages = {493-512},
doi = {10.2140/agt.2006.6.493},
zbl = {1114.53049},
language = {en},
url = {http://dml.mathdoc.fr/item/05029610}
}
Ekholm, Tobias. Regular homotopy and total curvature. II: Sphere immersions into 3-space.. Geometry & Topology, Tome 6 (2006) pp. 493-512. doi : 10.2140/agt.2006.6.493. http://gdmltest.u-ga.fr/item/05029610/