Relationships of waving rate, waving length, and swimming velocity in the 50 m surface - Comparison of the finalists and the non-finalists in the world championships of Finswimming - Oshita, K.; Ross, M.; Koizumi, K.; Yano, S.; Kashimoto, S.; Takahashi, K.; Kawakami, M. (Japanese Journal of Sciences in Swimming and Water Exercise, 2008)