Yusuf, Shahid <br/><br/>
About Urban mega regions: knowns and unknowns 
by Shahid Yusuf 
 - Washington, D.C.  World bank  2007 
 - 23p. 
 - Policy research working paper; 4252 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Urban mega regions