@article{DE_2004_40_8_a0,
     author = {V. V. Basov},
     title = {The {Generalized} {Normal} {Form} and {Formal} {Equivalence} of {Systems} of {Differential} {Equations} with {Zero} {Approximation} $(x_2^3,-x_1^3)$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1011--1022},
     publisher = {mathdoc},
     volume = {40},
     number = {8},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_8_a0/}
}