Voitsekhivska Т. Y., Melnyk V. М., Sumer А. R., and Shtykh М. М. “Environmental Performance of the Volkswagen 1,4 Engine in the Process of Its Operation on Biogas”. Oil and Gas Power Engineering, no. 1(35) (June 29, 2021): 81–90. Accessed November 21, 2024. https://nge.nung.edu.ua/index.php/nge/article/view/554.