@article {glewwe2004,
	title = {Retrospective vs. Prospective nalyses of School Inputs: The Case of Flip Charts in Kenya},
	journal = {Journal of Development Economics},
	volume = {74},
	year = {2004},
	pages = {251-268},
	author = {Paul Glewwe and Michael Kremer and Sylvie Moulin and Eric Zitzewitz}
}
