Sri Sumartiningsih and Anies Setiowati, The Effect of Breaststroke Swimming Exercise to Increase the Value of Peak Expiratory Flow. journal = {International Journal of Sport and Health Sciences}, [online]. World Academy of Science, Engineering and Technology. May 2011, vol. 53(5). 505 - 507 [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/9682.