TY  - RPRT
TI  - Iteration and recursion.
AU  - S Eilenberg
AU  - C C Elgot
PY  - 1968
DO  - 10.1073/pnas.61.2.378
UR  - https://pubmed.ncbi.nlm.nih.gov/16591693/
ID  - 16591693
ER  -