Hamo, F., and H. Abdullah. “Analysis of the Relationship Between Some Biokinematics Variables of Hand Palm from Inside and above Water With the Length of Hand Palm in the 25 M Butterfly Swimming”. Al-Rafidain Journal For Sport Sciences, vol. 17, no. 57, Dec. 2011, pp. 228-43, doi:10.33899/rajsport.2011.163152.