@article{Seubert2019,
  author    = {Sandra Seubert},
  title     = {Shifting boundaries of membership: the politicisation of free movement as a challenge for EU citizenship},
  journal   = {European law journal},
  volume    = {2019},
  pages     = {1 -- 13},
  doi       = {10.1111/eulj.12346},
  year      = {2019},
}