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二级参考文献3
1Westling F,Milson I,Zetterstrong A,et al.Effects of nitrous oxide/oxygen inhalation on the maternal circulation during vaginal delivery[].Acta Anaesthesiologica.1992
2Yaster M,Koehler RC,Traystman RJ.Interaction of fentanyl and nitrous oxide on peripheral and cerebral hemodynamics in newborn lambs[].Anesthesiology.1994
3Lawes EG,Newman B,Campbell MJ,et al.Maternal inspired oxygen concentration and neonatal status for caesarean section under general anaesthesia: comparison of effects of 33% or 50% oxygen in nitrous oxide[].British Journal of Anaesthesia.1998