The Single Market as an Engine for Employment through External Trade
Nuno Sousa, José M. Rueda-Cantuche, Valeria Andreoni, Iñaki Arto
Journal of Common Market Studies, vol. 51, 2013, p. 931-947.

Economic Growth and Budgetary Components: A Panel Assessment for the EU
António Afonso, Juan Gonzalez Alegre
Empirical Economics, vol. 41, 2011, p. 703-723.