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Kostis, P. C., & Kafka, K. I. (2022). The European Experience in Lifelong Learning and the Restructuring of the Economy. In Petrakis P.E. (Ed.) Human Capital and Production Structure in the Greek Economy: Knowledge Abilities, Skills (Vol. Chapter 8). Palgrave MacMillan. Publisher's Version

Kafka, K. I., Kostis, P. C., & Petrakis, P. E. (2022). Institutional Effects on Innovation and the Requirements for Structural Reforms. Journal of the Knowledge Economy, 13, 211-235.

Kostis, P., Dincer, H., & Yüksel, S. (2022). Knowledge-Based Energy Investments of European Economies and Policy Recommendations for Sustainable Development. Journal of the Knowledge Economy.