Shariat, M. A., S. Iranzadeh, and A. B. Zendeh. “Identification and Classification of Effective Operational Plans on Sustainable Production Using Repertory Grid and Principal Component Analysis: A Case Study on Industrial Production Companies in Semnan Province, Iran”. International Journal of Economics and Financial Issues, vol. 7, no. 6, Dec. 2017, pp. 82-96, https://www.econjournals.com/index.php/ijefi/article/view/5726.