1. (1) Janssen, L.J. and Emmelmann, H.-J., Aerodynamic Improvements─A Great Potential for Better Fuel Economy, SAE Paper No.780265, (1978), pp.1261-1269.
2. (3) Hucho, W.H., Janssen, L.T. and Emmelmann, H.J., The Optimization of Body Details─A Method for Reducing the Aerodynamic Drag of Road Vehicles, SAE Paper No.760185, (1976), pp.865-882.
3. (4) Bearman, P.W., Some Observations on Road Vehicle Wakes, SAE Paper No.840301, (1984), pp.504-515.
4. (5) Gad-el-Hak, M., Flow Control, (2000), Cambridge University Press.