D. M. Nhamussua, A. Prista, L. Basso, and G. Tani, “ Contextual interference and level of skill in the learning of volleyball serve ”, Rev Bras Educ Fís Esporte, vol. 26, no. 4, pp. 731–740, Dec. 2012, doi: 10.1590/S1807-55092012000400016.