J. Gray

A structured design methodology and associated software tools

J. Rowson, S. Trimberger, Charles R. Lang, 1981 .

Curves for group delay of low-pass Butterworth, Papoulis and elliptic responses

J. Gray, A.G.J. Holt, A. Holt, 1965 .

Transient Response of Elliptic Function Filters

J. Gray, J. Fidler, J. Fidler, 1968 .