Geodesic
Point mapping differential equations
Theoretical and applied mechanics, Tome 3 (1977) no. 1, p. 119 
Mirko Stojanović. Point mapping differential equations. Theoretical and applied mechanics, Tome 3 (1977) no. 1, p. 119 . http://geodesic.mathdoc.fr/item/TAM_1977_3_1_a14/
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1977_3_1_a14/}
}
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This method, based on the ideas of Poincare, Birkhoff and Lewis, plays an increasing role in modern practice, especially in pendulum oscillations with parametric excitations of a non-linear type, in satellite oscillations with variations in moments of inertia, in the movement of particles in a magnetic field, etc. 14 coefficients were calculated and their solutions were also given.