@article{article, title  = {{Approximation of the Duffing oscillator frequency response function using the FPK equation}},

 url = {{}},

 year = {{2011}},

 month = {{2}},

 author = {{Cross EJ and Worden K}},

 journal = {{Journal of Sound and Vibration}},

 note = {{Accessed on 2025/11/01}}}