references.bib

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@manual{bowers2009ritools,
 Author = {Bowers, Jake and Fredrickson, Mark and Hansen, Ben},
 Title = {RItools: Randomization Inference Tools},
 Year = {2009}}

@book{rosenbaum2010design,
	Author = {Rosenbaum, Paul R.},
	Month = {May},
	Publisher = {Springer},
	Title = {Design of Observational Studies},
	Url = {http://www.springer.com/statistics/statistical+theory+and+methods/book/978-1-4419-1212-1},
	Year = {2010},
	Bdsk-Url-1 = {http://www.springer.com/statistics/statistical+theory+and+methods/book/978-1-4419-1212-1}}

@article{imbens2005robust,
	Author = {Imbens, G.W. and Rosenbaum, P.R.},
	Journal = {Journal of the Royal Statistical Society Series A},
	Number = {1},
	Pages = {109--126},
	Publisher = {Blackwell Publishing},
	Title = {Robust, accurate confidence intervals with a weak instrument: quarter of birth and education},
	Volume = {168},
	Year = {2005}}