European Commission : Directorate-General for Economic and Financial Affairs., Roger, W., Denis, C., McMorrow, K., & Veugelers, R. (2005). The Lisbon strategy and the EU's structural productivity problem. Brussels ; Belgium: European Commission: Directorate-General for Economic and Financial Affairs.

European Commission : Directorate-General for Economic and Financial Affairs., Werner Roger, Cecile Denis, Kieran McMorrow, and R. Veugelers. The Lisbon Strategy and the EU's Structural Productivity Problem. Brussels ; Belgium: European Commission: Directorate-General for Economic and Financial Affairs, 2005.

European Commission : Directorate-General for Economic and Financial Affairs., et al. The Lisbon Strategy and the EU's Structural Productivity Problem. Brussels ; Belgium: European Commission: Directorate-General for Economic and Financial Affairs, 2005.