1. Audretch, D.B. (2004). Sustaining Innovation and Growth: Public Policy Support for Entrepreneurship. Industry and Innovation, 11(3), 167–191.
2. Bonilla, O.S. (2003). Competitiveness, Systems of Innovation and the Learning Economy: The Forest Sector in Costa Rica. Forest Policy and Economics, 5, 373–384.
3. Burbidge, I.B., Megee, L., Veall, M.R. (1985). On the Seasonality of Vector Autoregression Residuals. Economic Letters, 18, 137–141.
4. Crowley, P. (2005). Innovation Activity in the New Member States and Candidate Countries. Brussels: Statistics in Focus: Science and Technology.
5. Dickey, D.A., Fuller, W.A. (1979). Distribution of the Estimators for Autoregressive Time Series with Unit Root. Journal of the American Statistical Association, 74, 427–431.