@article{15363,
  author = {Trygve B{\ae}rland and Miroslav Kuchta and Kent-Andre Mardal},
  title = {Multigrid Methods for Discrete Fractional Sobolev Spaces},
  year = {2019},
  journal = {SIAM Journal on Scientific Computing},
  volume = {41},
  number = {2},
  pages = {A948{\textendash}A972},
  publisher = {{SIAM},
}