Autonomous robot navigation for precision horticulture. - Tony Hague; John A. Marchant; N. D. Tillett (ICRA, 1997)

An Autonomous Crop Treatment Robot. - Ben Southall; Tony Hague; N. D. Tillett (Int. J. Robotics Res., 2002)

Dealing with Color Changes Caused by Natural Illumination in Outdoor Machine Vision. - John A. Marchant; N. D. Tillett; Christine M. Onyango (Cybern. Syst., 2004)