R. Mohsin, Z.A. Majid, A. H. Shihnan, N.S. Nasri, Z. Sharer and R.C.Ma 2015. Effects of Multi-Variant Biofuel on Engine Performance and Exhaust Emission of DDF Engine System. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 6, 1 (Feb. 2015), 1–18.