Determining chorionicity and amnionicity in multiple pregnancies
2002 Contemporary OB/GYN

Multiple Gestation Associated with Increased Risk of Perinatal Morbidity and Mortality
1998 American College of Obstetricians and Gynecologists

Multiple Pregnancy
The College of Physicians & Surgeons of Manitoba 

Multiple Pregnancy
MatWeb Directory

Twins

• Assessment of Intrauterine Death of One Twin
• Diagnosis and Staging of Twin Transfusion Syndrome
• Twin-Twin Transfusion Syndrome Study
   University of California, San Francisco
• Twin to Twin Transfusion Treatment
  2000 Florida Institute for Fetal Diagnosis and Therapy
• Twin-to-Twin Transfusion Syndrome
  OBGYN.net - The Female Patient 
• Twin-to-twin transfusion syndrome (Stuck twin)
  TheFetus.net