2THOMSON M W, FRELUND A R, PALLAS R, MILLER K D. General motors 2.3L quad 4 engine[C]//SAE Paper 870353.
3FRANKLIN M L, KITTELSON D B. A PC-based fuel and ignition control system used to map the 3-D surfaces of torque and emissions versus air-fuel ratio and ignition timing[ C] //SAE Paper 940546.
4FRANKLIN M L, KITTELSON D B. Synchronous, simultaneous optimization of ignition timing and air-fuel ratio in a gas fueled S. I. engine[C] // SAE Paper 940547.
