Versal deformations of a singular point of a vector field on the plane in the case of zero eigenvalues
Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 2.

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R. I. Bogdanov. Versal deformations of a singular point of a vector field on the plane in the case of zero eigenvalues. Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 2. http://geodesic.mathdoc.fr/item/FAA_1975_9_2_a9/

[1] Arnold V.I., UMN, XXVII:5 (1972), 119–184 | MR | Zbl

[2] Tom R., Levin G., Osobennosti differentsiruemykh otobrazhenii, Mir, M., 1968, 10–79 | MR