1. http://www.vr.org.vn/thong-ke/Pages/tong-hop-so-lieu-phuong-tien-giao-thong-trong-ca-nuoc.aspx (2021)
2. N.T. Tung, L.V. Van, Principles of Internal Combustion Engines. (Science and Technology Publishing House, Vietnam, 2021)
3. https://tmhpp.com.vn/d4/news/He-thong-tiet-kiem-nhien-lieu-cho-dong-co-su-dung-khi-dien-phan-HHO-1-2202.aspx
4. http://brownsgas.com/history.html
5. N.N. Patil, Generation of oxy-hydrogen gas and its effect on the performance of spark ignition engine. IOP Conf Ser. Mater. Sci. Eng. 263 (2017)