A comparison of selected digital halftoning techniques. - Graham A. Stephen (Microprocess. Microsystems, 1991)

Sweeping Away the Problems that Dog the Industry? - Graham A. Stephen; Paul Mather (AI Commun., 1992)

String Searching Algorithms - Graham A. Stephen (World Scientific, 1994)

What is SP? - Graham A. Stephen; Paul Mather (Comput. J., 1994)