@misc{indiciae6e2f09b7e4f4,
  title = {Hierarchical evolutive systems: a mathematical model for complex systems.},
  author = {A C Ehresmann and J P Vanbremeersch},
  year = {1987},
  doi = {10.1007/bf02459958},
  url = {https://pubmed.ncbi.nlm.nih.gov/3607335/},
  note = {Source identifier: 3607335}
}