Tamm, Carl Olof. <br/><br/>
Nitrogen in terrestrial ecosystems :  questions of productivity, vegetational changes and ecosystem stability / 
Carl Olof Tamm. 
 - Berlin :  Springer-Verlag,  1991. 
 - 115 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>354051807X 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Nitrogen cycles.<br/> Biotic communities.<br/> Plants, Effect of nitrogen on.<br/> Ecology.<br/> Forest ecology.