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View all- Hoseinitabatabaei SGluhak ATafazolli RHeadley W(2014)Design, Realization, and Evaluation of uDirect-An Approach for Pervasive Observation of User Facing Direction on Mobile PhonesIEEE Transactions on Mobile Computing10.1109/TMC.2013.5313:9(1981-1994)Online publication date: Sep-2014