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3. Technic of catheterization of umbilical artery and clinical results of treatment of 124 patients;Vidyasagar;Clin. Pediatr.,1970
4. Umbilical vessel catheterization;Egan;Am. J. Dis. Child.,1971
5. Advantages and complications of umbilical artery catheterization in the newborn;Cochran;Pediatrics,1968