TY  - RPRT
TI  - Biological nitrogen fixation.
AU  - R H Burris
AU  - G P Roberts
PY  - 1993
DO  - 10.1146/annurev.nu.13.070193.001533
UR  - https://pubmed.ncbi.nlm.nih.gov/8369149/
ID  - 8369149
ER  -