@article{GDZPPN002059258, title = {Canonical Vector Fields on Spheres.}, journal = {Commentarii mathematici Helvetici}, volume = {43}, year = {1968}, pages = {341-347}, zbl = {0175.20201}, url = {http://dml.mathdoc.fr/item/GDZPPN002059258} }
Zvengrowski, P. Canonical Vector Fields on Spheres.. Commentarii mathematici Helvetici, Tome 43 (1968) pp. 341-347. http://gdmltest.u-ga.fr/item/GDZPPN002059258/