San Segundo, Eugenia, and Jonathan Delgado. “A Qualitative Systematic Review of Intra-Speaker Variation in the Human Voice”. Journal of Speech Sciences 14, no. 00 (October 13, 2025): e025019. Accessed October 19, 2025. https://econtents.sbu.unicamp.br/inpec/index.php/joss/article/view/20738.