[1] Middleton A, Neumann B, Khatri D )2008) Development of dedicated CNG engine with multipoint gas injection system. SAE Technical Paper 2008-28-0014.

[2] Garg M, Ravikrishna R (2010) CFD modeling of in-cylinder fuel-air mixing in a CNG-fueled SI engine with port gas injection. SAE Technical Paper 2010-32-0003.

[3] Shanmugam M, Kankariya R, Honvault N, Srinivasan J (2010) Performance and emission characterization of 1.2L MPI engine with multiple fuels (E10, LPG and CNG). SAE Int J Fuels Lubr 3(1): 334-352

[4] Obiols J, Soleri D, Dioc N, Moreau M (2011) Potential of concomitant injection of CNG and gasoline on a 1.6L gasoline direct injection turbocharged engine. SAE Technical Paper 2011-01-1995.

[5] Midhun VS, Karthikeyan S, Nagarajan S, Rairikar SD, Kavathekar KP, Thipse SS, Marathe NV (2011)  Development of CNG injection engine to meet future euro-V emission norms for LCV applications. SAE Technical Paper 2011-26-0002

[6] Shinde TB (2012) Experimental investigation on effect of combustion chamber geometry and port fuel injection system for CNG engine. IOSR J Eng 2(7): 49-54

[7] Midhun VS, Karthikeyan S, Krishnan S, Tyagi, AA, Rairikar SD, Kavathekar KP, Thipse SS, Marathe NV (2013) Development of three cylinder CNG engine for LCV application. SAE Technical Paper 2013-26-0009.

[8] Bircann R, Kazour Y, Dauer K, Fujita M, Wells A, Francis D, Husted K, Harry K (2013) Cold performance challenges with CNG PFI injectors. SAE Technical Paper 2013-01-0863

[9] Chintala V, Subramanian KA (2013) A CFD study for optimization of gas injector orientation for performance improvement of a dual-fuel diesel engine. J Energy 57: 709-721

[10] Hall J, Bassett M, Hibberd B, Streng S (2016) Heavily downsized demonstrator engine optimized for CNG operation.  SAE Int J Engines 9(4): 2250-2261

[11] Yang C, li W, Yin J, Shen Y (2017) Port fuel injection of CNG for downsized 1-liter 3-cylinder turbocharged Engine with high efficiency. SAE Technical Paper 2017-01-2275.

[12] Rahai H, Lee Y, rahimi N, Gada K (2017) Investigations of the effect of humid air on NOx and PM emissions of a CNG engine. SAE Technical Paper 2017-01-0783.

[13] Patel NM, Patel AD (2017) A parametric study for optimization of gas injector orientation and its effect on duel fuel engine using CNG as fuel. Int J Appl Eng Res 12(19): 8556-8559

[14] Patel R, Brahmbhatt P (2018) Performance characteristics comparison of CNG port and CNG direct injection in spark ignition engine. Eur J Sustain Dev Res 2(2) ;26-36

[15] Adlercreutz L, Cronhjort A, Stenlaas O (2019) Variation in squish length and swirl to reach higher levels of EGR in a CNG engine. SAE Technical Paper 2019-01-0081.

[16] Adlercreutz L, Cronhjort A, Stenlaas O, Particle emission measurements in a SI CNG engine using oils with controlled ash content. SAE Technical Paper 2019-01-0053.

[17] Mohammadi A (2010) Numerical simulation of spark ignition engines, numerical simulations - examples and applications in computational fluid dynamics. Lutz Angermann (Ed.). ISBN: 978-953-307, InTech.

 [19] میرزایی ص، محمدی آ، فجری ح ر، پریور ا ح (1398) بهبود عملکرد موتور اشتعال جرقه ای به کمک اصلاح مسیر خروجی دود. یازدهمین همایش بین المللی موتورهای درونسوز و نفت، ساپکو، تهران، ایران.