Cortela, Caio, Roberto Klering, Gabriel Gonçalves, Silvio Souza, and Carlos Balbinotti. 2016. “Early Specialization in Sports: A Factor to Be Considered in Brazilian Tennis Players?”. ITF Coaching & Sport Science Review 24 (70). London, U.K.:19-21. https://doi.org/10.52383/itfcoaching.v24i70.214.