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@article{MAN_1986__274_164087, author = {F. E. Burstall}, title = {A {Twistor} {Description} of {Harmonic} {Maps} of a {2-Sphere} into a {Grassmannian.}}, journal = {Mathematische Annalen}, pages = {61--74}, publisher = {mathdoc}, volume = {274}, year = {1986}, zbl = {0575.58018}, url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164087/} }
F. E. Burstall. A Twistor Description of Harmonic Maps of a 2-Sphere into a Grassmannian.. Mathematische Annalen, Tome 274 (1986), pp. 61-74. http://geodesic.mathdoc.fr/item/MAN_1986__274_164087/