@article{article927,
  title = {Shift from the central place theory to the urban network theory in urban systems research},
  author = {ÇÖTELİ, M.G. and YENEN, Z.},
  journal = {Sigma Journal of Engineering and Natural Sciences},
  year = {2012},
  volume = {4},
  pages = {45-63},
  doi = {}
}