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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
2009 1
2015 1
2016 1
2021 0
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Why GPS makes distances bigger than they are.
Ranacher P, Brunauer R, Trutschnig W, Van der Spek S, Reich S. Ranacher P, et al. Among authors: van der spek s. Int J Geogr Inf Sci. 2016 Feb 1;30(2):316-333. doi: 10.1080/13658816.2015.1086924. Epub 2015 Nov 16. Int J Geogr Inf Sci. 2016. PMID: 27019610 Free PMC article.
Sensing Human Activity: GPS Tracking.
van der Spek S, van Schaick J, de Bois P, de Haan R. van der Spek S, et al. Sensors (Basel). 2009;9(4):3033-55. doi: 10.3390/s90403033. Epub 2009 Apr 24. Sensors (Basel). 2009. PMID: 22574061 Free PMC article.