Martin, David <br/><br/>
Geographic information systems :  socioeconomic applications / 
David Martin 
 - 2nd ed. 
 - London :  Routledge,  1996 
 - xxii, 210 p. :  ill. ;  25 cm. 
<br/><br/>p. 192-206 
<br/><br/><label>ISBN: </label>0415125715  RM185.85 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems