1. Du, K., Calautit, J., Wang, Z., Wu, Y., & Liu, H. (2018). Applied Energy, 220, 242.
2. IEA. (2019). Key world energy statistics.
https://www.connaissancedesenergies.org/sites/default/files/pdf-actualites/Key_World_Energy_Statistics_2019.pdf
. Accessed Oct 30, 2019.
3. Brady, J. E., & Humiston, G. E. (1986). General chemistry: Principles and structure (4th ed., pp. 375–377). New York, Chichester: Wiley.
4. Sharma, S. D., & Sagara, K. (2005). International Journal of Green Energy, 2, 1.
5. Kenisarin, M., & Mahkamov, K. (2007). Renewable and Sustainable Energy Reviews, 11, 1913.