1. Benirschke K, Kaufmann P, Baergen RN (2006) Placental shape aberrations. In: Benirschke K, Kaufmann P, Baergen RN (eds) Pathology of the human placenta, 5th edn. Springer, New York, p 452
2. Chihara H, Otsubo Y, Ohta Y, Araki T (2000) Prenatal diagnosis of succenturiate lobes by ultrasonography and color Doppler imaging. Arch Gynecol Obstet 263:137–138
3. Cunningham FG, Leveno KJ, Bloom SL, Hauth JC, Gilstrap L, Wenstrom KD (2005) Placental abnormalities. In: Cunningham FG, Leveno KJ, Bloom SL, Hauth JC, Gilstrap L, Wenstrom KD (eds) Williams obstetrics, 22nd edn. McGraw Hill, New York, p 620
4. Hasegawa J, Matsuoka R, Ichizuka K, Fujikawa H, Sekizawa A, Okai T (2007) Umbilical cord insertion to the lower uterine segment is a risk factor for vasa previa. Fetal Diagn Ther 22:358–360
5. Hata K, Hata T, Aoki H, Takamori H, Takamiya O, Kitao M (1988) Succenturiate placenta diagnosed by ultrasound. Gynecol Obstet Invest 25:273–276