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@article{UBHD-68094649, author={John, Steffen and Hahmann, Stefan and Rousell, Adam and Zipf, Alexander}, title={Deriving incline values for street networks from voluntarily collected GPS traces}, year={2016}, pages={152-169}, language={eng}, issn={1545-0465}, volume={44}, number={2}, journal={Cartography and geographic information science}, doi={10.1080/15230406.2016.1190300}, }