1. A simple electrocardiographic indication of left atrial enlargement
2. P wave of electrocardiogram in early ischaemic heart disease;Bethell, H.J.N.; Nixon, P.G.F.;British Heart Journal,1972
3. Pathologic and electrocardiographic study of the auricles;Kaufman, J.; Scott, R.C.;Journal of Laboratory and Clinical Medicine,1949
4. A method for the electrocardiographic recognition of atrial enlargement;de Oliveira, J., and Zimmerman, H. A.;Circulation; Auricular overloadings. Electrocardiographic analysis of 193 cases,1959
5. Simultaneous recording of heart pulses and sounds