Geodesic
Martinet~--- Ramis modulus for a quadratic system
Čelâbinskij fiziko-matematičeskij žurnal, Tome 1 (2016) no. 3, pp. 86-91

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The polynomial differential equations of order 2 are considered. So we used correspondence map and normalizing transformation to get coefficients of Martinet — Ramis modulus.
Keywords: Martinet — Ramis modulus, saddlenode, central manifold. 
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     author = {M. M. Turov},
     title = {Martinet~--- {Ramis} modulus for a quadratic system},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CHFMJ_2016_1_3_a6/}
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M. M. Turov. Martinet~--- Ramis modulus for a quadratic system. Čelâbinskij fiziko-matematičeskij žurnal, Tome 1 (2016) no. 3, pp. 86-91. http://geodesic.mathdoc.fr/item/CHFMJ_2016_1_3_a6/