1. P J Bartie, 2004, Development of a Speech Based Augmented Reality System to Support Exploration of Cityscape (Edinburgh as a Case Study) . Unpublished MSc Thesis, Institute of Geography, University of Edinburgh
2. B J Beesley, 2003, Sky Viewshed Modelling for GPS Use in the Urban Environment . Unpublished M.S. Thesis, Department of Geography, University of South Carolina
3. Spatial discourse and navigation: an analysis of route directions in the city of Venice
4. Different Spoken Language Dialogues for Different Tasks