Is Information Power? Using Mobile Phones and Free Newspapers during an Election in Mozambique
  	  Jenny C. Aker,
  	  Paul Collier,
  	  Pedro Vicente
	Review of Economics and Statistics, 
vol. 99, 2017, p. 185-200.
Determinants of Vertical Integration in Export Processing: Theory and Evidence from China
  	  Ana P.  Fernandes,
  	  Heiwai Tang
	Journal of Development Economics, 
vol. 99, 2012, p. 396-414.