TY - JOUR AU - A. V. Tyrin TI - Harmonic spheres in compact Lie groups and extremals of a~multivalued Novikov functional JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1991 SP - 233 EP - 234 VL - 46 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1991_46_3_a15/ LA - en ID - RM_1991_46_3_a15 ER -