European Commission : Directorate-General for Economic and Financial Affairs., Denis, C., Grenouilleau, D., McMorrow, K., & Roger, W. (2006). Calculating potential growth rates and output gaps: A revised production function approach. Brussels- Belgium: European Comission: Directorate-General for Economic and Financial Affairs.

European Commission : Directorate-General for Economic and Financial Affairs., Cecile Denis, Daniel Grenouilleau, Kieran McMorrow, and Werner Roger. Calculating Potential Growth Rates and Output Gaps: A Revised Production Function Approach. Brussels- Belgium: European Comission: Directorate-General for Economic and Financial Affairs, 2006.

European Commission : Directorate-General for Economic and Financial Affairs., et al. Calculating Potential Growth Rates and Output Gaps: A Revised Production Function Approach. Brussels- Belgium: European Comission: Directorate-General for Economic and Financial Affairs, 2006.