El- Agraa, Ali Mohammed. <br/><br/>
International trade / 
Ali M. El- Agraa. 
 - Hampshire:  The Macmillan Press Ltd.,  1989. 
 - xii, 314 p. ;  23 cm. 
<br/><br/>Bibliography : p. 289-306. 
<br/><br/>
<br/><br/><label>ISBN: </label>0333464443 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Foreign trade--Mathematical models.