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2. F.D. Werner, R.C. Greig, How Golf Clubs Really Work and How to Optimize Their Design; 2000.
3. The physics of putting;Penner;Can. J. Phys,2002
4. The run of a golf ball;Penner;Can. J. Phys,2002
5. The physics of golf: The optimum loft of a driver;Penner;Am. J. Phys,2001