5 IZA Policy Papers
IZA Policy Paper No. 191
IZA Policy Paper No. 58
IZA Policy Paper No. 43
IZA Policy Paper No. 34
published in: "Social Insurance, Informality, and the Labor Market: How to Protect Workers while Creating Good Jobs". M. Frolich, D. Kaplan, C. Pages, J. Rigolini, and D. Robalino eds. Oxford University Press, 2014.