Geodesic
Invariant conditions of stability of unperturbed motion governed by some differential systems in the plane
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2017), pp. 88-106

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Center-affine invariant conditions of the stability of unperturbed motion were determined for differential systems in the plane with polynomial nonlinearities in non-critical cases and for differential systems in the plane with polynomial nonlinearities up to the fourth degree inclusive in critical cases. 
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     author = {Natalia Neagu and Victor Orlov and Mihail Popa},
     title = {Invariant conditions of stability of unperturbed motion governed by some differential systems in the plane},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {88--106},
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     number = {3},
     year = {2017},
     language = {en},
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}
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Natalia Neagu; Victor Orlov; Mihail Popa. Invariant conditions of stability of unperturbed motion governed by some differential systems in the plane. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2017), pp. 88-106. http://geodesic.mathdoc.fr/item/BASM_2017_3_a6/