1. Electrocardiograph studies in normal dairy cattle;Alfredson;J. Agr. Res.,1942
2. An analysis of time relations of the electrocardiogram;Bazett;Heart,1918
3. Calcium (ionized and total), magnesium, phosphorus and glucose in plasma from parturient cows;Blum;Amer. J. Vet. Res.,1972
4. Herz - und Kreislauf wir Kungen von Kalzium infusionen bei weider Käuern;Hapke;Dtsch. Tierarztl. Wschr.,1968
5. Electrocardiograms of normal dairy cows;Lank;Amer. J. Vet. Res.,1959