Research Article

Duffing-Type Oscillator with a Bounded from above Potential in the Presence of Saddle-Center Bifurcation and Singular Perturbation: Frequency Control

Figure 4

Phase portraits for (from top-left to bottom-right): 2.5 2 ; 0 (heteroclinic connections between two saddles of associated system, ); 1; 2 ( ); 2.5 .
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