Stroke characteristics of world class male swimmers in freestyle events of the 9th FINA World Swimming Championships 2001 Fukuoka - Okuno, K.; Ikuta, Y.; Wakayoshi, K.; Nomura, T.; Takagi, H.; Ito, S.; Ogita, F.; Ohgi, Y.; Tachi, M.; Miyashita, M. (Biomechanics and Medicine in Swimming IX, 2003)