@article {Evaluating2000,
title = {Evaluating State Programmes: 'Natural Experiments' and Propensity Scores},
year = {2000},
url = {https://www.esri.ie/publications/evaluating-state-programmes-natural-experiments-and-propensity-scores},
author = {Conniffe, D., Gash, V., and O'Connell, P.},
journal = {The Economic and Social Review, Vol. 31 No. 4},
}