N. Atamari-Anahui, L. Paucar-Tito, M. S. Ccorahua-Ríos, L. Morales-Concha, and L. E. Girón-López, “Cervical ectopic pregnancy. Report of two cases”, Rev. Cuerpo Med. HNAAA, vol. 13, no. 3, pp. 315–318, Dec. 2020.