1. Euro 5/6 Standards: Regulation 715/2007 and several comitology regulations. http://www.dieselnet.com/standards/eu/ld.php (2009/2014)
2. Steimle, F., Kulzer, A., Richter, H., Schwarzenthal, D., Romberg, C.: Systematic analysis and particle emission reduction of homogeneous direct injection SI engines. SAE technical paper 2013-01-0248. (2013). doi: 10.4271/2013-01-0248
3. Winkelhofer, E., Fuchs, H., Hirsch, A., Kapus, P.: Stabilität der Partikelemissionen von GDI Brennverfahren—Diagnose im Motorbetrieb”, Diesel-und Benzindirekteinspritzung (7th congress), 279-287, Berlin, ISBN 978-3-8169-3180-5 (2013)
4. Imoehl, W., Gestri, L., Maragliulo, M., Del-Frate, L., Klepatsch, M., Wildeson, R.: A DOE approach to engine deposit testing used to optimize the design of a gasoline direct injector seat and orifice. SAE Int. J. Fuels Lubr. (2012). doi: 10.4271/2012-01-1642
5. Birgel, A., Ladommatos, N., Aleiferis, P., Milovanovic, N., Lacey, P., Richards, P.: Investigations on deposit formation in the holes of diesel injector nozzles. SAE 2011-01-1924 (2011)