1. Gerasimov, A.A., Aleksandrov, I.S., & Dorokhov, P.I. (2015). Energy Efficiency in Engineering Systems: Module Reference Book. Kaliningrad.
2. Siegenthaler, J. (January, 2011). How to Improve the Energy Efficiency of Boiler Systems. Available at https://www.weilmclain.com/news/boiler-systems-and-energy-saving
3. Laptev, A.G., Nikolaev, N.A., & Basharov, M.M. (2011). Methods of Intensification and Modelling of Heat and Mass Transfer Processes: Educational and Reference Manual. Moscow. [in Russian]
4. Stehlik, P., Jegla, Z., & Kilkovsky, B. (2013). Possibilities of Intensifying Heat Transfer in Heat Exchangers for High Temperature Applications. Chemical Engineering Transactions, 35, 439–444. doi:10.3303/CET1335073
5. Zhang, T. (2020). Methods of Improving the Efficiency of Thermal Power Plants. Journal of Physics: Conference Series, 1449, 012001. doi:10.1088/1742-6596/1449/1/012001