8Hong Y, Li JX. Biomechanics of Tai Chi: a review. Sports Biomech , 2007, 6(3) :453 - 64.
9Voukelatos A, Cumming RG, Lord SR, Rissel C. A randomized, controlled trial of tai chi for the prevention of falls: the Central Sydney tai ehi trial. J Am Geriatr Soc, 2007, 55(8) : 1185 - 91.
10Li Y, Devault CN, Van Oteghen S. Effects of extended Tai Chi intervention on balance and selected motor functions of the elderly. Am J Chin Med, 2007, 35(3) : 383 - 9.
