Geodesic
A Generalized Normal Form and Formal Equivalence of Systems of Differential Equations with Zero Characteristic Numbers
Differencialʹnye uravneniâ, Tome 39 (2003) no. 2, pp. 154-170 
V. V. Basov. A Generalized Normal Form and Formal Equivalence of Systems of Differential Equations with Zero Characteristic Numbers. Differencialʹnye uravneniâ, Tome 39 (2003) no. 2, pp. 154-170. http://geodesic.mathdoc.fr/item/DE_2003_39_2_a1/
@article{DE_2003_39_2_a1,
     author = {V. V. Basov},
     title = {A {Generalized} {Normal} {Form} and {Formal} {Equivalence} of {Systems} of {Differential} {Equations} with {Zero} {Characteristic} {Numbers}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {154--170},
     year = {2003},
     volume = {39},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_2_a1/}
}
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