TY  - BOOK
AU  - Stewart, William Duncan Patterson
TI  - Nitrogen fixation by free-living microorganisms
T2  - International Biological Programme
U1  - 631.46 
PY  - 1975///
CY  - London
PB  - Cambridge University
KW  - Bacterias nitrificantes
KW  - Nitrógeno
KW  - Fijación
ER  -