1. Vaginal Expulsion of a Placental Polyp With Ergometrine
   Osamu Wada-Hiraike et al, 2009, JAPANESE JOURNAL OF GYNECOLOGIC AND OBSTETRIC ENDOSCOPY CrossRef
2. A Rare Medical Dilemma: Presentation and Management of Placental Polyp
   Raghad Alhussami et al, 2020, Cureus CrossRef