Aakko, P. and Nylund, N-O. (2003) Particle emissions at moderate and cold temperatures using different fuels. IEA/AMF Task 32. Project report PRO3/P5057/03. EN 589:2008+A1:2012

Hendriksen, P. Vermeulen, R., Rijkeboer, R., Bremmers, D., Smokers, R. and Winkel, R. (2003) Evaluation of the environmental performance of modern passenger cars running on petrol, diesel, automotive LPG and CNG, TNO-report 03.OR.VM.055.1/PHE.

JRC (2007) Well-to-Wheels analysis of future automotive fuels and powertrains in the European context, WELL-to-WHEELS Report Version 2c, March 2007.

JRC (2008) Well-to-Wheels analysis of future automotive fuels and powertrains in the European context, TANK-to-WHEELS Report version 3, October 2008.

IEA (2026) Sheltering from Oil Shocks: Road Transport Fuels, International Energy Agency.

Neste (2018) Neste Delivers First Batch of 100% Renewable Propane to European Market, Neste Corporation, March 2018.

Nylund, N-O., Ikonen, M., Lappi, M., Kytö, M., Westerholm, M. and Laurikko, J. (1996) Performance evaluation of alternative fuel/engine concepts 1990-1995. Final report including addendum of diesel vehicles. VTT Publications 271. ISBN951-38-4929-5.

Rehnlund, B. (2008) IEA/AMF Outlook on standardization of Alternative vehicle fuels Global, Regional and National level. Task 28 Sub task Report, October 2008.

Tasic, T., Pogorevc, P. & Brajlih, T. (2011) Gasoline and LPG exhaust emissions comparison, Advances in production engineering & management, 6 (2011) 2, 87-94, ISSN 1854-6250.

Verbeek, R., Smokers, G., Kadijk, A., Hensema, G.L.M., Passier, E., Rabé, B., Kampman, I.J. and Riemersma, I. (2008) Impact of biofuels on air pollutant emissions from road vehicles, TNO report, MONRPT- 033-DTS-2008-01737, June 2008

WLPGA (2023) Statistical Review of Global LPG 2023, World Liquid Gas Association, 2023.

World Liquid Gas Association (WLGA), website https://www.worldliquidgas.org/about-liquid-gas/what-is-liquid-gas/where-does-lpg-come-from/ (Accessed 12th of August 2026)