Roberts, Fred S. <br/><br/>
Discrete mathematical models :  with applications to social, biological, and environmental problems / 
Fred S. Roberts 
 - Englewood Cliffs :  Prentice-Hall,  1976 
 - xvi, 559 p. :  ill. ;  23 cm. 
<br/><br/>Includes Indexes 
<br/><br/><label>ISBN: </label>013214171X 
<br/><br/><label>LCCN: </label>75-020153 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology--Mathematical models.<br/>Social sciences