Aldabbag, A., and N. M. A. AL- sharoog. “Effect of Using the Declivity and Pyramid Weights Training Systems on Some Aspects of Muscular Strength and Basic Skills in the Volleyball”. Al-Rafidain Journal For Sport Sciences, vol. 16, no. 54, Aug. 2010, pp. 215-36, doi:10.33899/rajsport.2010.6009.