42
by Deininger, Klaus W.
Published 2003
Oxford University Press

44
by Ravallion, Martin
Published 2008
World Bank

47
by Stuggins, Gary
Published 2013
World Bank

50
by Wang, Xiaodong
Published 2010
World Bank

55
Published 1999
World Bank Group

60
by Kumar, Nalini
Published 2000
World Bank