1. Perigenital hematomas. Analysis of 47 consecutive cases;Sotto;Obstet Gynecol,1958
2. Postpartum paravaginal hematoma;Duckman;Brooklyn Hosp J,1947
3. Vulvovaginal hematomas complicating delivery. Rationale for drainage of the hematoma cavity;Zahn;J Reprod Med,1996
4. Perinatal genital hematomas;Sheikh;Obstet Gynecol,1971
5. The Swedish Medical Birth Register. http://www.sos.se/fulltext/112/2003-112-3/2003-112-3.pdf