@misc{indiciae8ba262858299,
  title = {Persistent tangled vortex rings in generic excitable media.},
  author = {A T Winfree},
  year = {1994},
  doi = {10.1038/371233a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/8078583/},
  note = {Source identifier: 8078583}
}