1. Extrasystoles and Allied Arrhythmias;Scherf,1953
2. Clinical Electrocardiography. Part I. The Arrhythmias;Katz,1956
3. Observations upon disorders of the heart's action;Lewis;Heart,1912
4. The Mechanism and Graphic Registration of the Heart Beat;Lewis,1911
5. Concealed A-V conduction: the effect of blocked impulses on the formation and conduction of subsequent impulses;Langendorf;Amer Heart J,1948