Landy, H.J.; Weiner, S.; Corson, S.L.; Batzer, F.R. (1986). "The "vanishing twin": ultrasonographic assessment of fetal disappearance in the first trimester". Am J Obstet Gynecol 155 (1): 14–19. doi:10.1016/0002-9378(86)90068-2. ببمد: 3524235.
Pelega, D.; Ferber, A.; Orvieto, R.; Bar-Hava, I. (1988). "Single intrauterine fetal death (fetus papyraceus) due to uterine trauma in a twin pregnancy". European Journal of Obstetrics & Gynecology and Reproductive Biology 80 (2): 175–176. doi:10.1016/S0301-2115(98)00128-6. ببمد: 9846663.