@misc{indiciae65b2565c9a9b,
  title = {A Majorant Method For Non-Linear Partial Differential Equations.},
  author = {S Bergman and M Schiffer},
  year = {1951},
  doi = {10.1073/pnas.37.11.744},
  url = {https://pubmed.ncbi.nlm.nih.gov/16578414/},
  note = {Source identifier: 16578414}
}