TY  - RPRT
TI  - New window on Proterozoic life
AU  - A H Knoll
AU  - N J Butterfield
PY  - 1989
DO  - 10.1038/337602a0
UR  - https://pubmed.ncbi.nlm.nih.gov/11538342/
ID  - 11538342
ER  -