@article{FAA_1990_24_1_a4,
     author = {V. Yu. Ovsienko and B. A. Khesin},
     title = {Symplectic leaves of the {Gel'fand--Dikii} brackets and homotopy classes of nondegenerate curves},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {38--47},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1990_24_1_a4/}
}