@article{MAN_1981__257_163563,
     author = {Thomas Landes},
     title = {Geometry of {Spheres:} {On} a {Conjecture} of {J.} {J.} {Sch\"affer.}},
     journal = {Mathematische Annalen},
     pages = {367--370},
     publisher = {mathdoc},
     volume = {257},
     year = {1981},
     zbl = {0469.46013},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__257_163563/}
}