@article{CMH_1968__43_139372,
     author = {P. Zvengrowski},
     title = {Canonical {Vector} {Fields} on {Spheres.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {341--347},
     publisher = {mathdoc},
     volume = {43},
     year = {1968},
     zbl = {0175.20201},
     url = {http://geodesic.mathdoc.fr/item/CMH_1968__43_139372/}
}