de Souza, I. S., L. Vicentini, M. dos R. Morbi, and R. F. R. Marques. “The Relative Age Effect on the Development of Soccer Goalkeepers in Brazil: Men and Women Elite Scenarios”. Journal of Physical Education , Vol. 31, no. 1, Aug. 2020, p. e-3173, doi:10.4025/jphyseduc.v31i1.3173.