Margalef, Ram�n. <br/><br/>
Perspectives in ecological theory / 
Ramon Margalef. 
 - Chicago :  University of Chicago Press,  1968. 
 - viii, 111 p. :  ill. 
 - Chicago series in biology [v. 1]. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.