David Dearman Alex Varshavsky Eyal de Lara Khai N. Truong An Exploration of Location Error Estimation. 181-198 2007 conf/huc/2007 Ubicomp http://dx.doi.org/10.1007/978-3-540-74853-3_11 db/conf/huc/ubicomp2007.html#DearmanVLT07