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@article{CMH_1986__61_140047, author = {Wolfgang Ziller and Hermann Gluck}, title = {On the volume of a unit vector field on the three-sphere.}, journal = {Commentarii mathematici Helvetici}, pages = {177--192}, publisher = {mathdoc}, volume = {61}, year = {1986}, zbl = {0605.53022}, url = {http://geodesic.mathdoc.fr/item/CMH_1986__61_140047/} }
Wolfgang Ziller; Hermann Gluck. On the volume of a unit vector field on the three-sphere.. Commentarii mathematici Helvetici, Tome 61 (1986), pp. 177-192. http://geodesic.mathdoc.fr/item/CMH_1986__61_140047/