TY  - RPRT
TI  - Hierarchical evolutive systems: a mathematical model for complex systems.
AU  - A C Ehresmann
AU  - J P Vanbremeersch
PY  - 1987
DO  - 10.1007/bf02459958
UR  - https://pubmed.ncbi.nlm.nih.gov/3607335/
ID  - 3607335
ER  -