@misc{indiciaecf6b6e7ecfd4,
  title = {Problems of Potential Theory.},
  author = {P G Evans},
  year = {1921},
  doi = {10.1073/pnas.7.3.89},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576584/},
  note = {Source identifier: 16576584}
}