@article{MZ_1984__186_173452,
     author = {Udo Simon and Michael Kozlowski},
     title = {Minimal {Immersions} of {2-Manifolds} into {Spheres.}},
     journal = {Mathematische Zeitschrift},
     pages = {377--382},
     year = {1984},
     volume = {186},
     zbl = {0543.53045},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__186_173452/}
}