Ueasin, N., A. Wongchai, and S. Nonthapot. “Performance Assessment and Optimization of Biomass Steam Turbine Power Plants by Data Envelopment Analysis”. International Journal of Energy Economics and Policy, vol. 5, no. 3, July 2015, pp. 668-72, https://econjournals.com/index.php/ijeep/article/view/1231.