@misc{indiciae7cfa06e854bb,
  title = {A Uniqueness Theorem for Eigenfunction Expansions.},
  author = {S Minakshisundaram},
  year = {1947},
  doi = {10.1073/pnas.33.4.76},
  url = {https://pubmed.ncbi.nlm.nih.gov/16578249/},
  note = {Source identifier: 16578249}
}