Bovenberg, A. and Jacobs, B. (2005). Redistribution and education subsidies are Siamese twins Journal of Public Economics, 89(11-12):2005--2035.
Abbring, J.H., van den Berg, G. and van Ours, J.C. (2005). The effect of unemployment insurance sanctions on the transition rate from unemployment to employment Economic Journal, 115(505):602--630.