Mathematical demography  selected paper 
David Smith, Nathan Keyfitz. 
 - New York  Springer-Verlag  1976. 
 - xi, 514 p. : ill. ; 25 cm. 
<br/><br/>Includes Index 
<br/><br/><label>ISBN: </label>3540078991 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Demography--Mathematical models--Addresses, essays, lectures