2Sepulveda WH,Gonzalez C,Cruz MA,et al.Vasoconstrictive effect of bile acid on iolated human placental choronic veins.Eur J Obstet Cynecol Reprod Boil,1991,42:211-215.
3Clausson B,Cnattingus S,Axelsson O.Outcomes of postterm births,The role of fetal growth restriction and malformations.Obstet Cynecol,1999,94:758.
4Eden RD,Seifert LS,Wineyar A et al.Perimatal characteristics of uncomplicated postdate pregnancies.Obstet Cynecol,1987,69:296.
5Chiang FE,Rodway RG.determinations of umbilical cord betaendorphin concentration and blood gas parameters in nerborm piglets.Res Vet Sci,1997,63:107-111.
6Kraczkiwsk;JJ,Semczuk M.Porownanie zmian W cznej receptorow mu-opiosdowych W mozgach doroslych szczurow pod wplywen pyzeby tego niedtienienid priedporodowego 2 poporodowego.Oinekol Pol,1998,69:963-967.
7Takitak,Herlonius EA,Lindahi SG,et al.Actions of opioids on rorpiratory cutrity via actinaslf mu-delea and kovppareelors:an in vitro study.Brain Res,1997,778:233-241.
8Zhong X,Zhang T,Ding H,et al.Plasma levels of beta-erdorphin lewire ehephalin and in passeits with essential lypercersion and theffects of clonidine.Int Cardiol,1995,51:233-244.
9Radvnovie N,Lockwood CJ,Ghiolini A,et al.Is fetal blood sampling associated with increased beta-endorphin release into the fetal circulation.Am J Perinatol,1993,10:112-114.
10Rothen berg SJ,Chicz DA,Schnaas L,et al.Umbilical cord betendorphin and early childhood motor develpment.Early Hum Dev,1996,46:83-95.
