@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/}
}