@article{GDZPPN002066106,
title = {On the volume of a unit vector field on the three-sphere.},
journal = {Commentarii mathematici Helvetici},
volume = {61},
year = {1986},
pages = {177-192},
zbl = {0605.53022},
url = {http://dml.mathdoc.fr/item/GDZPPN002066106}
}
Ziller, Wolfgang; Gluck, Hermann. On the volume of a unit vector field on the three-sphere.. Commentarii mathematici Helvetici, Tome 61 (1986) pp. 177-192. http://gdmltest.u-ga.fr/item/GDZPPN002066106/