1. Double pregnancy: report of a case with 35 days between deliveries;Abrams;Obstet. Gynecol.,1957
2. Triplet pregnancy with second trimester abortion and delivery of twins at 35 week's gestation;Banchi;Obstet. Gynecol.,1984
3. Fatal urea plasma infection in second twin born 60 days after delivery of the first in a patient with recurrent spontaneous abortion – a case report;Brion;J. Perinat. Med.,1986
4. Triplet pregnancy with delivery on three separate days;Cardwell;Obstet. Gynecol.,1988
5. Erfolgreiche weitere Prolongation unreifer Zwilingschwangeschaft durch Tocolyse and Re-Cerclage nach unanfhaltsquer Geburt des ersten Feten nach Norfall-Cerclage;Conradt;Geburtshilfe. Frauenheilkd.,1982