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Christiane Rousseau, Huaiping Zhu, “PP-graphics with a nilpotent elliptic singularity in quadratic systems and Hilbert's 16th problem”, Journal of Differential Equations, 196:1 (2004), 169
D. Novikov, S. Yu. Yakovenko, “Quasialgebraicity of Picard–Vessiot fields”, Mosc. Math. J., 3:2 (2003), 551–591
F. Dumortier, A. Guzmán, C. Rousseau, “Finite cyclicity of elementary graphics surrounding a focus or center in quadratic systems”, Qual Th Dyn Syst, 3:1 (2002), 123
А. О. Ремизов, “Неявные дифференциальные уравнения и векторные поля с неизолированными особыми точками”, Матем. сб., 193:11 (2002), 105–124 ; A. O. Remizov, “Implicit differential equations and vector fields with non-isolated singular points”, Sb. Math., 193:11 (2002), 1671–1690
Stefan Siegmund, “Normal Forms for Nonautonomous Differential Equations”, Journal of Differential Equations, 178:2 (2002), 541
Huaiping Zhu, Christiane Rousseau, “Finite Cyclicity of Graphics with a Nilpotent Singularity of Saddle or Elliptic Type”, Journal of Differential Equations, 178:2 (2002), 325
Dumortier F. Ilyashenko Y. Rousseau C., “Normal Forms Near a Saddle-Node and Applications to Finite Cyclicity of Graphics”, Ergod. Theory Dyn. Syst., 22:Part 3 (2002), 783–818
Ilyashenko Y., “Centennial History of Hilbert's 16th Problem”, Bull. Amer. Math. Soc., 39:3 (2002), 301–354
Giuseppe Gaeta, “Poincaré Normal and Renormalized Forms”, Acta Applicandae Mathematicae, 70:1-3 (2002), 113