1. P. M. Elizarov, “Orbital analytic nonequivalence of saddle resonance vector fields in $(\mathbf C^2,0)$”, Math. USSR-Sb., 51:2 (1985), 533–547  mathnet  crossref  mathscinet  zmath
  2. P. M. Elizarov, Yu. S. Ilyashenko, “Remarks on the orbital analytic classification of germs of vector fields”, Math. USSR-Sb., 49:1 (1984), 111–124  mathnet  crossref  mathscinet  zmath
  3. R. I. Bogdanov, “Singularities of vector fields on a plane”, Funct. Anal. Appl., 11:4 (1977), 303–304  mathnet  crossref  mathscinet  zmath
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