WASET
Ghazal, O. , Najjar, Y. , AL-Khishali, K.. "Effect of Inlet Valve Variable Timing in the Spark Ignition Engine on Achieving Greener Transport". World Academy of Science, Engineering and Technology, Open Science Index 59, International Journal of Mechanical and Mechatronics Engineering, (2011), 5(11), 2536 - 2540.