@misc{indiciae86ad32df32fc,
  title = {Lower bounds for eigenvalues of self-adjoint problems.},
  author = {G G Gundersen},
  year = {1979},
  doi = {10.1073/pnas.76.11.5424},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592718/},
  note = {Source identifier: 16592718}
}