@article{LiRybskiKropp2019,
  author    = {Yunfei Li and Diego Rybski and J{\"u}rgen Kropp},
  title     = {Singularity cities},
  journal   = {Environment and planning. B, Urban analytics and city science},
  volume    = {48},
  number    = {1},
  pages     = {43 -- 59},
  doi       = {10.1177/2399808319843534},
  year      = {2019},
}