Thomas, R. W. <br/><br/>
Modelling in Geography  a mathematical approach 
R. W. Thomas & R. J. Huggett. 
 - London :  Harper & Row,  1980. 
 - xii, 338 pages :  illustrations ;  23 cm. 
<br/><br/>p. 321-329 
<br/><br/><label>ISBN: </label>0063181711 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography--Mathematical models