The effects of EGR and ignition timing on emissions of GDI engine Zhao, LiFeng ; Yu, XiuMin ; Qian, DingChao ; Dong, Wei ; Sun, Ping ; He, Ling ; Yang, Song Abstract Publication: Science in China E: Technological Sciences Pub Date: December 2013 DOI: 10.1007/s11431-013-5379-y Bibcode: 2013ScChE..56.3144Z