TY  - BOOK
AU  - Sprent, J. I. Sprent, P.
AU  - Janet, I. Sprent, 
AU  - Peter, Sprent.
TI  - Nitrogen fixing organisms
SN  - 041234680
PY  - 1990///
CY  - London
PB  - Chapman and Hall
KW  - Nitrogen fixation
KW  - Biology of nitrogen fixing organisms
ER  -