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- [6] PREGNANCY AND TWIN DELIVERY JOURNAL DE GYNECOLOGIE OBSTETRIQUE ET BIOLOGIE DE LA REPRODUCTION, 1977, 6 (05): : 633 - 660
- [10] PERINATAL-MORTALITY IN TWIN PREGNANCY - A REVIEW OF 799 TWIN PREGNANCIES SOUTH AFRICAN MEDICAL JOURNAL, 1987, 71 (02): : 73 - 74