Why Have Aggregate Skilled Hours Become So Cyclical since the Mid-1980s?
Rui Castro, Daniele Coen-Pirani
International Economic Review, vol. 49, 2008, p. 135-184.

Compensations As Signaling Devices in the Political Economy of Reforms
Rui Castro, Daniele Coen-Pirani
International Economic Review, vol. 44, 2003, p. 1061-1078.