@misc{indiciaeecda0dd764b4,
  title = {On the Eigenfunctions and Eigenvalues of the General Linear Elliptic Differential Operator.},
  author = {F E Browder},
  year = {1953},
  doi = {10.1073/pnas.39.5.433},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589287/},
  note = {Source identifier: 16589287}
}