Sivitska, Svitlana, Vira Vartsaba, and Olena Filonych. “Buildings Energy-Efficient Renovation Investment”. International Journal of Engineering and Technology 7, no. 3.2 (June 20, 2018): 408–412. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/14562.