RISZAL, A.; HARDIN, S. D. . .; WARDONO, H. . .; ES, M. D. S. . .; RISANO, A. Y. E. . The Effect of the use of Silica Sand Before and After Physical Activation on Acceleration of 4-Step Gasoline Motorcycle Engine. Journal of Engineering and Scientific Research, [S. l.], v. 4, n. 1, p. 30–33, 2022. DOI: 10.23960/jesr.v4i1.98. Disponível em: http://jesr.eng.unila.ac.id/index.php/ojs/article/view/98. Acesso em: 28 jun. 2025.