- Olivier Faugeras, Jose Gomes, The Mathematics of Surfaces IX, 2000, 227
- A.J. Krener, 3, Proceedings of the 37th IEEE Conference on Decision and Control (Cat. No.98CH36171), 1998, 3081
- “The Hausdorff dimension of small divisors for lower-dimensional KAM-tori”, Proc. R. Soc. Lond. A, 439, № 1906, 1992, 359
- E.E. Shnol', “The loss of stability of symmetrical equilibrium positions”, Journal of Applied Mathematics and Mechanics, 63, № 4, 1999, 531
- A. Luongo, A. Paolone, A. Di Egidio, “Sensitivities and Linear Stability Analysis Around a Double-Zero Eigenvalue”, AIAA Journal, 38, № 4, 2000, 702
- Freddy Dumortier, Robert Roussarie, Jorge Sotomayor, Henryk Żaładek, 1480, Bifurcations of Planar Vector Fields, 1991, 165
- J. Kevorkian, “Perturbation Techniques for Oscillatory Systems with Slowly Varying Coefficients”, SIAM Rev., 29, № 3, 1987, 391
- V. Ajjarapu, B. Lee, “Bifurcation theory and its application to nonlinear dynamical phenomena in an electrical power system”, IEEE Trans. Power Syst., 7, № 1, 1992, 424
- J. C. Hurtubise, N. Kamran, 278, Painlevé Transcendents, 1992, 271
- Lei Guo, Qun Hong Li, Zi Gen Song, “The Application of Improved Recursive Formula for Computing Normal Forms of Four-Dimensional Nilpotent Dynamical Systems”, AMM, 437, 2013, 27