Melfou, Katerina, Athanasios Theocharopoulos, and Evangelos Papanagiotou. 2008. “The Structure of Production in Greek Agriculture: Elasticities of Substitution and Derived Factor Price Elasticities”. SPOUDAI Journal of Economics and Business 58 (3-4):80-95. http://spoudai.org/index.php/journal/article/view/330.