Setayesh, Mohammad-Hossein, et al. “Corporate Governance, Investment in Research and Development and Company Performance: A Data Envelopment Analysis Approach Based on Data from a Developing Country”. International Journal of Economics and Financial Issues, vol. 6, no. 3, July 2016, pp. 1114-22, https://econjournals.net.tr/index.php/ijefi/article/view/1957.