Versal deformations of a singular point of a vector field on the plane in the case of zero eigenvalues
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Tài liệu tham khảo
V. I. Arnol'd, Usp. Matem. Nauk,27, No. 5, 119?185 (1972).
R. Thom and G. Levine, Singularities of Differentiable Maps [Russian translation], Mir, Moscow (1968), pp. 10?79.