|  | SUREAL-23: Sub-23 Nm Particle Emissions from DIrect Injection Engines, Including Real Driving Conditions (APTL) |  | 2018-05-16 | 
|  | SUREAL-23: Understanding, measuring and regulating sub-23 Nm particle emissions from direct injection engines including real driving conditions (APTL) |  | 2018-11-07 |