1. (1) Schlichting, H., Boundary Layer Theory, 6th edition, (1968), p.17, McGraw-Hill.
2. Experiments on the flow past spheres at very high Reynolds numbers
3. The effects of surface roughness and tunnel blockage on the flow past spheres
4. Golf Ball Aerodynamics
5. (5) Aoki, K., Ohike, A., Yamaguchi, K. and Nakayama, Y., Flying Characteristics and Flow Pattern of a Sphere with Dimples, Journal of Visualization, Vol.6, No.1 (2003), pp.67-76.