1Makhseed M, Tomi N, Moussa M. A retrospective analysis of pathological placental implantation site and penetration. Int J Gynaecol Obstet, 1994,47(2) : 127-129.
2McDuffie RS, Harkness L, Mevay RW ,et al. Midtrimester hemoperitoneum caused by placenta in association with elevated maternal serum alpha fetoprotein level. Am J Obstet Gynecol, 1994,171 ( 2 ) :565 -568.
3Lerner JP, Dean S, Tritsch IE. Characterization of placenta accrete using transvaginal oncography and color Doppler imaging. Ultrasound Obstet Gynecol, 1995,5 ( 3 ) : 198-199.