@article{RM_1991_46_3_a15,
     author = {A. V. Tyrin},
     title = {Harmonic spheres in compact {Lie} groups and extremals of a~multivalued {Novikov} functional},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {233--234},
     publisher = {mathdoc},
     volume = {46},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1991_46_3_a15/}
}