@misc{indiciae36c6f8306b92,
  title = {REGULARITY THEOREMS FOR SOLUTIONS OF PARTIAL DIFFERENTIAL EQUATIONS WITH VARIABLE COEFFICIENTS.},
  author = {F E Browder},
  year = {1957},
  doi = {10.1073/pnas.43.2.234},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590004/},
  note = {Source identifier: 16590004}
}