Prontzas , P., C. Tsamadias, and P. Papageorgiou. “Public Education Expenditures and Growth in Greece over the Period 1960-2000”. SPOUDAI Journal of Economics and Business, vol. 59, no. 1-2, June 2009, pp. 125-41, http://spoudai.org/index.php/journal/article/view/286.