Geodesic
Classification of third-order linear differential equations and symplectic sheets of the Gel'fand–Dikii bracket
Matematičeskie zametki, Tome 47 (1990) no. 5, pp. 62-70 
V. Yu. Ovsienko. Classification of third-order linear differential equations and symplectic sheets of the Gel'fand–Dikii bracket. Matematičeskie zametki, Tome 47 (1990) no. 5, pp. 62-70. http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a8/
@article{MZM_1990_47_5_a8,
     author = {V. Yu. Ovsienko},
     title = {Classification of third-order linear differential equations and symplectic sheets of the {Gel'fand{\textendash}Dikii} bracket},
     journal = {Matemati\v{c}eskie zametki},
     pages = {62--70},
     year = {1990},
     volume = {47},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a8/}
}
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