@misc{indiciae3e266c42aeeb,
  title = {A THEOREM ON FORCE-FREE MAGNETIC FIELDS.},
  author = {L Woltjer},
  year = {1958},
  doi = {10.1073/pnas.44.6.489},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590226/},
  note = {Source identifier: 16590226}
}