S.Valli Priyatharsini
"Analysis of Homoclinic Bifurcation in a Nonlinearly Damped Duffing vander Pol Oscillator with the Excitation of Two Frequency Terms".
Nonlinear Studies,
https://scholar9.com/publication-detail/analysis-of-homoclinic-bifurcation-in-a-nonlinearl-2753