[1]
A. Riszal, S. D. . . Hardin, H. . . Wardono, M. D. S. . . ES, and A. Y. E. . Risano, “The Effect of the use of Silica Sand Before and After Physical Activation on Acceleration of 4-Step Gasoline Motorcycle Engine”, JESR, vol. 4, no. 1, pp. 30–33, Jun. 2022.