Guiracocha Suarez, Humberto, Daniel Alarcon, Charles Ramirez, and Robert Centeno. “Identification of the Variables Product of Pregnancy and Period of Pregnancy on Fetal Death through the Use of Chi-Square Statistic”. Ecuadorian Science Journal 3, no. 2 (September 6, 2019): 15–24. Accessed September 22, 2025. https://journals.gdeon.org/index.php/esj/article/view/35.