@article{Blundell2000,
author = {Richard Blundell and Monica Costa Dias},
title = {Evaluation methods for non-experimental data},
journal = {Fiscal Studies},
year = {2000},
month = {Jan},
volume = {21},
number = {4},
pages = {427-468},
issn = {Print: 0143-5671 Online: 1475-5890},
url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1475-5890.2000.tb00031.x/abstract},
}