Kulanov, A., A. Issakhova, O. Koshkina, P. Issakhova, and A. Karshalova. “Venture Financing and the Fuel and Energy Complex: Investing in Alternative Energy”. International Journal of Energy Economics and Policy, vol. 10, no. 5, Aug. 2020, pp. 531-8, https://www.econjournals.com/index.php/ijeep/article/view/9963.