1. Studies on the bovine electrocardiogram, II. Bundle branch block;Alfredson;Proc. Soc. exp. Biol. N.Y.,1940
2. Electrocardiograph studies in normal dairy cattle;Alfredson;J. agric. Res.,1942
3. Report of the committee of the American Heart Association on the standardization of electrocardiographic nomenclature
4. The unipolar electrocardiogram, a clinical interpretation;Barker,1952
5. Intervals in the electrocardiograms of calves fed with cod liver oil;Barnes;Connell Vet.,1938