Jeffrey Hightower, "From Position to Place," (.pdf) in Proceedings of The 2003 Workshop on Location-Aware Computing, pp. 10-12, Oct. 2003.

Emerging proactive applications want to reason about “place”, not coordinates. Existing systems rely on manually defining places which, while useful, does not scale to ubiquitous deployment. In this paper I define place and challenge the research community with learning and labeling places automatically.