TY  - BOOK
AU  - SIGEL, Helmut
TI  - Metal ions in biological systems. V 6. Biological action of metal ions
U1  - 574:541.132 
PY  - 1976///
CY  - New York
PB  - Marcel Dekker
KW  - Biological system
KW  - Metal ion
KW  - Nitrogen fixation
ER  -