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Mohamed Ismail NA, Ibrahim M, Mohd Naim N, Mahdy ZA, Jamil MA, Mohd Razi ZR (September 2008). “Nifedipine versus terbutaline for tocolysis in external cephalic version”. 《Int J Gynaecol Obstet》 102 (3): 263–6. doi:10.1016/j.ijgo.2008.04.010. PMID18554601. S2CID20258298.
Mohamed Ismail NA, Ibrahim M, Mohd Naim N, Mahdy ZA, Jamil MA, Mohd Razi ZR (September 2008). “Nifedipine versus terbutaline for tocolysis in external cephalic version”. 《Int J Gynaecol Obstet》 102 (3): 263–6. doi:10.1016/j.ijgo.2008.04.010. PMID18554601. S2CID20258298.