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@article{MZ_1988__200_3_174006, author = {Dirk Ferus and Ulrich Pinkall}, title = {Constant {Curvature} 2-spheres in the 4-sphere.}, journal = {Mathematische Zeitschrift}, pages = {265--272}, publisher = {mathdoc}, volume = {200}, number = {3}, year = {1988}, zbl = {0664.53029}, url = {http://geodesic.mathdoc.fr/item/MZ_1988__200_3_174006/} }
Dirk Ferus; Ulrich Pinkall. Constant Curvature 2-spheres in the 4-sphere.. Mathematische Zeitschrift, Tome 200 (1988) no. 3, pp. 265-272. http://geodesic.mathdoc.fr/item/MZ_1988__200_3_174006/