Cavanagh, P. R., Palmgren, J. V., Kerr, B. A. Published in Swimming II: Proceedings of the Second International Symposium on Biomechanics in Swimming, Brussels, Belgium (1975)
Boicev, K., Tzvetkov, A. Published in Swimming II: Proceedings of the Second International Symposium on Biomechanics in Swimming, Brussels, Belgium (1975)