Nikolaos, E., Evangelos, P. I., Dimitris, V. and Zoe, V. N. (2005) “Productivity, Product Differentiation And Profitability In The Greek Chemical Industry: An Empirical Analysis, 1991 And 2001”, International Business & Economics Research Journal (IBER), 4(10). doi: 10.19030/iber.v4i10.3630.