@misc{indiciae4568f562903b,
  title = {EIGENFUNCTION EXPANSIONS FOR SINGULAR ELLIPTIC OPERATORS. II. THE HILBERT SPACE ARGUMENT; PARABOLIC EQUATIONS ON OPEN MANIFOLDS.},
  author = {F E Browder},
  year = {1954},
  doi = {10.1073/pnas.40.6.459},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589506/},
  note = {Source identifier: 16589506}
}