Geodesic
Stokes formula for investigation of selfintersecting trajectories
Theoretical and applied mechanics, Tome 12 (1986) no. 1, p. 115 
Ya. V. Tatarinov. Stokes formula for investigation of selfintersecting trajectories. Theoretical and applied mechanics, Tome 12 (1986) no. 1, p. 115 . http://geodesic.mathdoc.fr/item/TAM_1986_12_1_a13/
@article{TAM_1986_12_1_a13,
     author = {Ya. V. Tatarinov},
     title = {Stokes formula for investigation of selfintersecting trajectories},
     journal = {Theoretical and applied mechanics},
     pages = {115 },
     year = {1986},
     volume = {12},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1986_12_1_a13/}
}
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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, under scertain condition, in natural systems with two degrees of freedom, the single side directed self intersecting trajectories do not exist. This holds in the neighbourhood of the stable equilibrium position of general type. It is shown how the intersection angle of the trajectory can be estimated.