@phdthesis{dnb-1810,
  title = {Qualitative reasoning about relative directions: computational complexity and practical algorithm},
  author = {Jae Hee Lee},
  year = {2013},
  url = {http://d-nb.info/1072077922},
  researchr = {https://researchr.org/publication/dnb-1810},
  cites = {0},
  citedby = {0},
  school = {University of Bremen},
}