@article{RM_2004_59_6_a9,
     author = {A. G. Sergeev},
     title = {Harmonic maps into homogeneous {Riemannian} manifolds: twistor approach},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1181--1203},
     publisher = {mathdoc},
     volume = {59},
     number = {6},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2004_59_6_a9/}
}