Soares, Jonathas Borges, et al. “ Sperm Tail Flexibility Test: A Simple Test for Selecting Viable Spermatozoa for Intracytoplasmic Sperm Injection from Semen Samples Without Motile Spermatozoa ”. Revista Do Hospital Das Clínicas, vol. 58, no. 5, Jan. 2003, pp. 250-3, https://doi.org/10.1590/S0041-87812003000500003.