L.O. Chua, H. Oka, “Normal forms for constrained nonlinear differential equations. I. Theory”, IEEE Trans. Circuits Syst., 35, № 7, 1988, 881
MAURICE DODSON, BRENT EVERITT, “Metrical Diophantine approximation for quaternions”, Math. Proc. Camb. Phil. Soc., 157, № 3, 2014, 513
Patrick J. Rabier, “Implicit differential equations near a singular point”, Journal of Mathematical Analysis and Applications, 144, № 2, 1989, 425
Computational Techniques for Voltage Stability Assessment and Control, 2007, 19
Stefan Liebscher, 2117, Bifurcation without Parameters, 2015, 81
Julio Guerrero, Francisco F López-Ruiz, “On the Lewis–Riesenfeld (Dodonov–Man’ko) invariant method”, Phys. Scr., 90, № 7, 2015, 074046
U. Sperhake, K. R. P. Sjödin, J. A. Vickers, “Dynamic cosmic strings. II. Numerical evolution of excited cosmic strings”, Phys. Rev. D, 63, № 2, 2000, 024012
Ulvi Yurtsever, “Singularities and horizons in the collisions of gravitational waves”, Phys. Rev. D, 40, № 2, 1989, 329
A. Vanderbauwhede, “Bifurcation of subharmonic solutions in time-reversible systems”, Z. angew. Math. Phys., 37, № 4, 1986, 455
The Method of Normal Forms, 2011, 315