Yang, Y.-C., Y.-C. Chiu, and C.-Y. Hong. “Analysis of Cost-Benefit and CO2 Emissions of Solar Energy-Intelligent Poultry Feeding System: Application of NPV and Dynamic Environmental I-O Model”. International Journal of Energy Economics and Policy, vol. 10, no. 1, Nov. 2019, pp. 178-84, https://www.econjournals.com/index.php/ijeep/article/view/8443.