Effect of Injection Pressure, Injection Duration, and Injection Frequency on Direct Injector’s Mass Flow Rate for Compressed Natural Gas FuelMohamad Hafizul Rahman Alias, Mohd Fadzil Abdul Rahim, Muhamad Haziq Mohd Ismail Rodzi and Rosli Abu BakarMATEC Web Conf., 225 (2018) 02008DOI: https://doi.org/10.1051/matecconf/201822502008