Y. Ghellab, and Kirill Voinov. “New Effective Way to Protect Our Air Against Gases from Plants, Boiler-Houses and Cars”. Global Journals of Research in Engineering 17, no. J4 (July 15, 2017): 55–59. Accessed May 2, 2024. https://engineeringresearch.org/index.php/GJRE/article/view/1675.