1. Appropriate discounting for benefit-cost analysis;Burgess;Journal of Benefit-Cost Analysis,2011
2. Calmes , J. 2009 O bama back in I ndiana with message and aid The New York Times http://www.nyt imes.com/2009/08/06/us/polit ics/06obama.html?_r=1&scp=1&sq=navistar%20obama&st=cse