1. Electrocardiographic studies in normal infants and children;Ziegler,1951
2. An electrocardiographic study of normal newborn infants;Lue;Acta Paediatr Sin,1962
3. The normal electrocardiogram in newborns and infants (a critical review);Liebman,1966
4. The electrocardiogram in normal newborn infants: correlation with hemodynamic observations;Emmanouilides;J Pediatr,1965
5. Normal ECG standards for infants and children;Davignon;Pediatr Cardiol,1979