Maradin, Dario, and Ljerka Cerović. “Possibilities of Applying the DEA Method in the Assessment of Efficiency of Companies in the Electric Power Industry: Review of Wind Energy Companies”. International Journal of Energy Economics and Policy, vol. 4, no. 3, May 2014, pp. 320-6, https://econjournals.com/index.php/ijeep/article/view/805.