Methods for evaluating biological nitrogen fixation / 
edited by F. J. Bergersen. 
 - Chichester :  John Wiley & Sons,  1980. 
 - 702 p. :  ill. ;  23 cm. 
<br/><br/> 'A Wiley-Interscience publication'. 
<br/><br/>Bibliography : p.637-680. 
<br/><br/><label>ISBN: </label>0471277592 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen--Fixation--Measurement.