Cardoso, A.R., and Miguel  Portela. ?Micro Foundations For Wage Flexibility: Wage Insurance At The Firm Level?. Scandinavian Journal Of Economics 111. Scandinavian Journal Of Economics  (2009): 29-50.

Cardoso, A.R., Miguel  Portela, C.  Sá, and F.  Alexandre. ?Demand For Higher Education Programs: The Impact Of The Bologna Process?. Cesifo Economic Studies 54. Cesifo Economic Studies  (2008): 229-247.