@article{MAN_1982__261_182866,
     author = {Kunio Sakamoto},
     title = {Helical {Immersions} {Into} a {Unit} {Sphere.}},
     journal = {Mathematische Annalen},
     pages = {63--80},
     year = {1982},
     volume = {261},
     zbl = {0476.53033},
     url = {http://geodesic.mathdoc.fr/item/MAN_1982__261_182866/}
}