Terrain influences the accurate judgement of distance. Sinai, J, M., Ooi, Leng, T., He, & J, Z. Nature, 395(6701):497--500, Nature Publishing Group, 1998.
bibtex   
@article{ Sinai_etal98,
  author = {Sinai, Michael J and Ooi, Teng Leng and He, Zijiang J},
  title = {Terrain influences the accurate judgement of distance},
  journal = {Nature},
  year = {1998},
  volume = {395},
  pages = {497--500},
  number = {6701},
  publisher = {Nature Publishing Group}
}

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