1. Day to day and beat to beat variation in normal 3 orthogonal lead electrocardiograms;Cawood, H.T.; Macfarlane, P.W.; Hillis, S.; Lawrie, T.D.V.;British Heart Journal,1974
2. The statistical treatment of angular data in vectorcardiography;Downs, T.D.; Liebman, J.; Agusti, R.; Romberg, H.C.,1966
3. Statistical methods for vectorcardiogram orientations;Downs, T.D.; Liebman, J.; MacKay, W.,1971
4. Routine automated electrocardiogram interpretation;Macfarlane, P.W.; Cawood, H.T.; Taylor, T.P.; Lawrie, T.D.V.;Bio-Medical Engineering,1972