An Investigation of Global Positioning System (GPS) Technology for Disabled People. - Paul Blenkhorn; David Gareth Evans; Stephen Pettitt (ICCHP, 1994)

Sentinel: Universal Access to Ambient Devices. - Simon Harper; Carole A. Goble; Stephen Pettitt (HCI (4), 2003)

proXimity: Ad-Hoc Networks for Enhanced Mobility. - Simon Harper; Stephen Pettitt; Carole A. Goble (ICCHP, 2004)

proXimity: Walking the Link. - Simon Harper; Carole A. Goble; Stephen Pettitt (J. Digit. Inf., 2004)