F. Alwan Saleh, A. Shakir Mahmood, M. Kadhim Allawi, and A. K. S. . Al-Sayyab, “The Effect of Hydrogen on Performance of Internal Combustion Engine Fueled by Compressed Natural Gas”, J. eng. sustain. dev., vol. 29, no. 3, pp. 338–343, May 2025, doi: 10.31272/jeasd.2689.