H. Zhang

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

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

Simple Mechanical Control Systems with Constraints and Symmetry

H. Zhang, J. Cortés, S. Martínez, 2002, SIAM J. Control. Optim..

GENERALISED TRANSFER FUNCTIONS OF NEURAL NETWORKS

S. A. Billings, H. Zhang, C. F. Fung, 1997 .

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

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