TY  - RPRT
TI  - Three stages in the evolution of the genetic code.
AU  - U Baumann
AU  - J Oro
PY  - 1993
DO  - 10.1016/0303-2647(93)90089-u
UR  - https://pubmed.ncbi.nlm.nih.gov/8374065/
ID  - 8374065
ER  -