2T- Y. Shiang(相子元) ,C. Liu and Z. R. Chen, The effect of impact velocity on baseball COR curve, The Engineering of Sport 4 [M]. Japen:Black Science Ltd, 121 -127.
3Galina P. Ivanova, Energy translation in the “strikerbalr”system during impact, Proceeding of ⅩⅤⅢ ISBS,中国香港,2000.43- 46.
4M. J. Carre, M.J. Johnson & S.J. Haake, Playing performance of tennis court surface, The Engineering of Sport 4, 2002: 200 - 206.
