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Versal deformation of a singularity of a vector field on the plane in the case of zero eigenvalues. (English. Russian original) Zbl 0518.58030
Sel. Math. Sov. 1, 389-421 (1981); translation from Tr. Semin. Im. I. G. Petrovskogo 2, 37-65 (1976).

MSC:
37G99 Local and nonlocal bifurcation theory for dynamical systems
58C25 Differentiable maps on manifolds
58K99 Theory of singularities and catastrophe theory
37G15 Bifurcations of limit cycles and periodic orbits in dynamical systems
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