@article{DiPrete2004,
author = {DiPrete, T.A. and Gangl, M.},
title= {Assessing bias in the estimation of causal effects: Rosenbaum bounds on matching estimators and instrumental variables estimation with imperfect instruments},
year = {2004},
doi = {10.1111/j.0081-1750.2004.00154.x},
journal = {Sociological Methodology},
volume = {34},
number = {1},
pages = {271--310},
}