@article{Abatangelo2020,
  author    = {Nicola Abatangelo},
  title     = {A remark on nonlocal Neumann conditions for the fractional Laplacian},
  journal   = {Archiv der Mathematik},
  volume    = {114},
  number    = {6},
  pages     = {699 -- 708},
  doi       = {10.1007/s00013-020-01440-9},
  year      = {2020},
}