Barbosa, T., Sousa, F., & Vilas-Boas, J. P. (1999). Kinematical modifications induced by the introduction of the lateral inspiration in butterfly stroke. Biomechanics and medicine in swimming VIII : Proceedings of the International Symposium on Biomechanics and Medicine in Swimming. University of Jyväskyla, Finland June 28 - July 2, 1998, S. 15-19.

Barbosa, Tiago, Filipa Sousa, and J. Paulo Vilas-Boas. "Kinematical Modifications Induced By the Introduction of the Lateral Inspiration in Butterfly Stroke." Biomechanics and Medicine in Swimming VIII : Proceedings of the International Symposium On Biomechanics and Medicine in Swimming. University of Jyväskyla, Finland June 28 - July 2, 1998 1999: S. 15-19.

Barbosa, Tiago, Filipa Sousa, and J. Paulo Vilas-Boas. "Kinematical Modifications Induced By the Introduction of the Lateral Inspiration in Butterfly Stroke." Biomechanics and Medicine in Swimming VIII : Proceedings of the International Symposium On Biomechanics and Medicine in Swimming. University of Jyväskyla, Finland June 28 - July 2, 1998 1999: S. 15-19.