H. Zhang

Frequency response functions for nonlinear rational models

S. Billings, Q. M. Zhu, H. Zhang, 1995 .

Analysing non-linear systems in the frequency domain--I. The transfer function

S. Billings, H. Zhang, 1993 .

Gain bounds of higher-order nonlinear transfer functions

S. Billings, H. Zhang, 1996 .

Computation of non-linear transfer functions when constant terms are present

S. A. Billings, H. Zhang, S. Billings, 1995 .

Unwrapping the phase response functions for non-linear systems

S. Billings, H. Zhang, 1995 .

Analysing non-linear systems in the frequency domain--II. The phase response

S. A. Billings, H. Zhang, S. Billings, 1994 .