1. Normal electrocardiogram;Kossmann;Circulation,1953
2. Observer variation in reports on electrocardiograms;Davis;Brit. Heart J.,1958
3. Observer error and variation in interpretation of electrocardiograms in epidemiological study of coronary heart disease;Acheson;Brit. J. Prev. Soc. Med.,1960
4. Electrocardiogram and its interpretation: Study of reports by 20 physicians on a set of 100 electrocardiograms;Segall;Canada M. A. J.,1960
5. Observer variation in interpretation of electrocardiograms;Epstein;J.A.M.A.,1961