1. Mansor W. N. W. (2014). Dual Fuel Engine Combustion and Emissions – An Experimental Investigation Coupled With Computer Simulation, PhD Thesis, Colorado State University.
2. Smallwood, J.S., (2013). Investigation of the Dual-Fuel Conversion of a Direct Injection Diesel Engine, MSc thesis, West Virginia University.
3. Chengke L., (2006). An Experimental and Analytical Investigation into the Combustion Characteristics of HCCI and Dual Fuel Engines with Pilot Injection, PhD Thesis, University of Calgary.
4. Mtui P. and Hill, P., (1996). Ignition Delay and Combustion Duration with Natural Gas Fueling of Diesel Engines, SAE Technical Paper 9, 61933.
5. Miyake M., Biwa T., Endoh Y., Shimotsu M., Murakami S., Komoda T., (1983). The development of high output, highly efficient gas burning diesel engines. 15th CIMAC Conference Proceedings; A2: 1193–1216.