1. Proper localisation of umbilical arterial catheters and venous catheters by lateral roentegenogram;Baker, D.; Berdon, W.; James, S.;Pediatrics
2. Umbilical venous catheterisation in the newborn: identification of correct positioning;Rosen, S.; Reich, S.;Radiology,1970
3. Positioning of umbilical arterial catheters with ultrasound;Garg, A.K.; Houston, A.B.; Laing, J.M.; Mackenzie, JR;Arch Dis Child,1983
4. Placement of umbilical venous catheters with use ofbedside real-time ultrasonography;Greenberg, M.; Movahed, H.; Peterson, B.; Bejar, R.;JPediatr,1995
5. The echocardigraphic examination;Feigenbaum, H.,1986