3 IZA Discussion Papers
IZA Discussion Paper No. 5668
published in: The Review of Black Political Economy, 2012, 39 (3), 285-297
IZA Discussion Paper No. 4659
revised version published as 'Do Immigrant Groups Differ in Welfare Usage? Evidence from the U.S.A' in: Atlantic Economic Journal, 2011, 39 (3), 231-247
IZA Discussion Paper No. 2792
revised version published in: Labour Economics, 2009, 16(2), 161-170