Observing Outdoor Activity Using Global Positioning System-Enabled Cell Phones
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2007 ◽
Vol 1992
(1)
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pp. 54-60
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2015 ◽
Vol 69
(Suppl. 1)
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pp. 6911500101p1
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2016 ◽
Vol 50
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pp. 65-68
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2015 ◽
Vol 57
(2)
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pp. 245-247
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