@misc{indiciae0e5b6df7ffe1,
  title = {A THEOREM ON STABILITY OF COMPLEX STRUCTURES.},
  author = {A Frölicher and A Nijenhuis},
  year = {1957},
  doi = {10.1073/pnas.43.2.239},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590006/},
  note = {Source identifier: 16590006}
}