1. Spicher U, Reissing J, Kech JM, Gindele J. Gasoline direct injection engines – development potentialities. SAE Technical Paper 1999, no 1999-01-2938.
2. Winklhofer E, Fraidl G. Developing clean GDI systems to meet euro 6 targets”. 10th International Symposium on Combustion Diagnostics, 2012, Baden Baden, Germany.
3. Buri S, Busch S, Kubach H, Spicher U. High injection pressures at the upper load limit of stratified operation in a DISI engine. SAE Technical Paper 2009, no 2009-01-2657.
4. Schumann F, Buri S, Kubach H, Spicher U. Investigation of particulate emissions from a DISI engine with injection pressures up to 1000bar. Aachener Kolloquium Fahrzeug- und Motorentechnik, 2010, Aachen, Germany.
5. Delphi: “Delphi premium GDI high pressure fuel pump”. http://delphi.com/shared/pdf/ppd/pwrtrn/premium-gdi-high-pressure-fuelpump.pdf, 2012.