The bifurcation set for the 1 : 4 resonance problem. Krauskopf, Bernd (1994) Experimental Mathematics
The stability study of a plane engine Rafał Kołodziej, Tomasz Nowicki (2000) Applicationes Mathematicae We study the dynamical properties of a plane engine vibrations modelled by a system of ODE.
Topologická klasifikácia diferenciálnych rovníc a štrukturálna stabilita Pavol Brunovský (1973) Pokroky matematiky, fyziky a astronomie