Orynkanova, Zhanar M., and Diana I. Stepanova. “Evaluation of the Economic Efficiency of Heat Recovery from Exhaust Gas of Diesel Power Plants in Kazakhstan”. International Journal of Energy Economics and Policy, vol. 10, no. 4, May 2020, pp. 399-04, https://econjournals.com.tr/index.php/ijeep/article/view/9360.