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Z.K. Peng,Z.Q. Lang,S.A. Billings,Y. Lu.Analysis of bilinear oscillators under harmonic loading using nonlinear output frequency response functions[J].International Journal of Mechanical Sciences,2007(11).
Z.Q. Lang,S.A. Billings,R. Yue,J. Li.Output frequency response function of nonlinear Volterra systems[J].Automatica,2007(5).
Z.K. Peng,Z.Q. Lang,S.A. Billings.Crack detection using nonlinear output frequency response functions[J].Journal of Sound and Vibration,2006(3).
Z. Q. Lang,S. A. Billings.Energy transfer properties of non-linear systems in the frequency domain[J].International Journal of Control,2005(5).