@article{MZ_1991__206_1_174251,
     author = {Udo Simon and An-Mi Li and Luc Vrancken},
     title = {Affine spheres with constant affine sectional cuvature.},
     journal = {Mathematische Zeitschrift},
     pages = {651--658},
     publisher = {mathdoc},
     volume = {206},
     number = {1},
     year = {1991},
     zbl = {0721.53014},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174251/}
}