Experimental Study of the Effect of Octane Number on the Performance Coefficients of the Two Strokes Spark Ignition Engine . Tikrit Journal of Engineering Sciences, [S. l.], v. 16, n. 3, p. 12–17, 2009. DOI: 10.25130/tjes.16.3.08. Disponível em: https://tj-es.com/ojs/index.php/tjes/article/view/613.. Acesso em: 9 sep. 2026.