Geodesic
Approximate form of reachable sets after perturbation of Liouville systems
Theoretical and applied mechanics, Tome 8 (1982) no. 1, p. 133 
Ya. Tatarinov. Approximate form of reachable sets after perturbation of Liouville systems. Theoretical and applied mechanics, Tome 8 (1982) no. 1, p. 133 . http://geodesic.mathdoc.fr/item/TAM_1982_8_1_a15/
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     author = {Ya. Tatarinov},
     title = {Approximate form of reachable sets after perturbation of {Liouville} systems},
     journal = {Theoretical and applied mechanics},
     pages = {133 },
     year = {1982},
     volume = {8},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1982_8_1_a15/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

It is shown that the set of points in Liouville systems of two degrees of freedom, which can be reached from an arbitrarily fixed initial position with a given modulo initial velocity, has the shape of a curvilinear octagon, which lies in the area of possible motion with the corresponding energy.