@misc{indiciae3a25013b16fe,
  title = {Observations from unperturbed closed loop systems cannot indicate causality.},
  author = {H van der Kooij and F C T van der Helm},
  year = {2005},
  doi = {10.1113/jphysiol.2005.569001},
  url = {https://pubmed.ncbi.nlm.nih.gov/16322059/},
  note = {Source identifier: 16322059}
}