1. Electrocardiographic Studies in Normal Infants and Children;Ziegler,1951
2. Electrocardiography in infants and children;Sodi-Pallares;Pediat. Clin. North America,1958
3. Clinical Electrocardiography;Grant,1957
4. On certain application of modern electrocardiographic theory;Bayley;Am. Heart J.,1943
5. Spatial Vectorcardiography;Grishman,1952