@misc{indiciae88cfb7bf8197,
  title = {The eigenfunction problem in higher dimensions: Exact results.},
  author = {B W Knight and L Sirovich},
  year = {1986},
  doi = {10.1073/pnas.83.3.527},
  url = {https://pubmed.ncbi.nlm.nih.gov/16593649/},
  note = {Source identifier: 16593649}
}