1. The history of vectorcardiography;Burch;Med. Hist. Suppl.,1985
2. Das Vectorcardiogram; Eine Untersuchungsmethode des Herzens;Schellong;Z. Kreislaufforsch.,1937
3. Study on heart function by vectorcardiography of three-dimensional projection;Kimura;Jpn. Circ. J.,1939
4. La Vectorcardiographie;Duchosal,1949
5. Spatial Vectorcardiography;Grishman,1952