Bifurcation diagram versus .
Detail of bifurcation diagram, u(0) versus .
phase-plane for , symmetric oscillation.
u(t) for , t is a normalized time, t=1 corresponds to .
plane for , asymmetric oscillation.
Bifurcation diagram of a closed branch of asymmetric solutions, u(0) versus .
Same as in Figure 7, but versus .
Duffing equation, plane, Poincaré set of the stroboscopic map, , fractal dimension D=2.381.