Amador, João and Cabral, Sónia (2008): International fragmentation of production in the Portuguese economy: What do different measures tell us? Published in: Banco de Portugal Working Paper No. 11 (July 2008): pp. 1-47.
Amador, João; Cabral, Sónia and Ramos Maria, José (2007): International Trade Patterns over the Last Four Decades: How does Portugal Compare with other Cohesion Countries? Published in: Banco de Portugal Working Paper No. 14-2007 (September 2007)
Amador, João and Cabral, Sónia (2008): Vertical specialization across the world: a relative measure. Published in: Banco de Portugal Working Papers No. 10-2008 (18. July 2008): pp. 1-28.
