Helpman, Elhanan. <br/><br/>
Market structure and foreign trade :  increasing returns, imperfect competition, and the international economy / 
Elhanan Helpman and Paul R. Krugman. 
 - Cambridge, Mass. :  MIT Press,  c1985. 
 - xii, 271 p. : 
<br/><br/><label>ISBN: </label>0262081504 
<br/><br/><label>Subjects--Topical Terms: </label><br/>International economic relations.
<br/><br/><label>Dewey Class. No.: </label>382  / Ma