@misc{indiciaed05df199ad1a,
  title = {Multiple limit cycles for predator-prey models.},
  author = {J Hofbauer and J W So},
  year = {1990},
  doi = {10.1016/0025-5564(90)90139-p},
  url = {https://pubmed.ncbi.nlm.nih.gov/2134514/},
  note = {Source identifier: 2134514}
}