TY - JOUR AU - V. Yu. Ovsienko AU - B. A. Khesin TI - Symplectic leaves of the Gel'fand--Dikii brackets and homotopy classes of nondegenerate curves JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1990 SP - 38 EP - 47 VL - 24 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1990_24_1_a4/ LA - ru ID - FAA_1990_24_1_a4 ER -