@unpublished{Windmeijer2000,
author = {Frank Windmeijer},
title = {A finite sample correction for the variance of linear two-step GMM estimators},
year = {2000},
month = {Nov},
volume = {pp},
doi = {10.1920/wp.ifs.2000.0019},
issn = {1742-0415},
url = {http://www.ifs.org.uk/wps/wp0019.pdf},
}