@article{IM_1985__81_143262,
     author = {U. Pinkall},
     title = {Hopf {Tori} in {S3.}},
     journal = {Inventiones mathematicae},
     pages = {379--386},
     publisher = {mathdoc},
     volume = {81},
     year = {1985},
     url = {http://geodesic.mathdoc.fr/item/IM_1985__81_143262/}
}