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14. [Twins as an unpleasant surprise]. Haspels AA; Klomp J; van Cappellen AW Ned Tijdschr Geneeskd; 1967 May; 111(18):826-8. PubMed ID: 6042306 [No Abstract] [Full Text] [Related]
15. [Fetal collision during labor]. Jaworski E Wiad Lek; 1968 Sep; 21(17):1597-9. PubMed ID: 5728024 [No Abstract] [Full Text] [Related]
16. Perinatal outcome of vaginally delivered twin gestations with a larger twin B. Usta IM; Nassar AH; Abu Musa AA; Awwad JT; Yunis KA; Seoud MA J Perinatol; 2003; 23(5):409-13. PubMed ID: 12847538 [TBL] [Abstract][Full Text] [Related]
17. [The second twin]. Arruti Ramírez F Ginecol Obstet Mex; 1966; 21(120):127-31. PubMed ID: 5950545 [No Abstract] [Full Text] [Related]
18. [Course of pregnancy and labor in primiparas according to age]. Scorta A Minerva Ginecol; 1965 Dec; 17(23):1147-54. PubMed ID: 5893776 [No Abstract] [Full Text] [Related]