TY  - GEN
AU  - Perera , K. Sarath D.
TI  - Nitrogen cycle & nitrogen fixation
SN  - 9552309212
U1  - 577.145 
PY  - 2003///
CY  - Colombo
PB  - Sampath publishers & printers
KW  - NITROGEN
KW  - NITROGEN CYCLE
KW  - NITROGENASE
KW  - BIOLOGY
ER  -