Geodesic
On the problem of determining the position of a non-linear discrete system in the phase space
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1967), pp. 132-137 
R. G. Pinelis. On the problem of determining the position of a non-linear discrete system in the phase space. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1967), pp. 132-137. http://geodesic.mathdoc.fr/item/VMUMM_1967_6_a15/
@article{VMUMM_1967_6_a15,
     author = {R. G. Pinelis},
     title = {On the problem of determining the position of a non-linear discrete system in the phase space},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {132--137},
     year = {1967},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1967_6_a15/}
}
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The paper deals with the problem of determining the position of a non-linear discrete system in the phase space, the behaviour of the system over the initial interval being unknown. The problem is solved by Ya. N. Roitenberg's method.