“Incidence of Ectopic Pregnancy at the ‘Enrique C. Sotomayor’ Gynecological-Obstetric Hospital from 1985-1990”. Revista Universidad De Guayaquil, vol. 82, no. 3-4, Dec. 1990, pp. 53-94, https://doi.org/10.53591/rug.v82i3-4.577.