Fernandes, R., Vilas-Boas, J. P. Julkaisussa Biomechanics and Medicine in Swimming VIII (1999)
Bar-Or, O. Julkaisussa Biomechanics and Medicine in Swimming VII (1996)
Gullstrand, L., Holmer, I. Julkaisussa Biomechanics and Medicine in Swimming (1983)