
Articles on the Internet:
Loss and Multi-fetal Pregnancies ~ by David Jones, M.D
Vanishing Twin Web Site has several articles regarding vanishing twin syndrome or early loss of a twin in pregnancy.
Twinless twins experience deep loss ~ article by Seattle Times
An Imprint For Life ~ Written by Leah LaGoy, this article is based on LaGoy's research showing the loss of an early twin in utero.