1. Electrical alternans in pericardial effusion;McGregor;Circulation,1955
2. Total electrical alternation in pericardial disease;Littman;Circulation,1953
3. Cardiac motion in patients with pericardial effusion;Feigenbaum;Circulation,1966
4. Electrical alternans, its mechanism demonstrated;Price;Circulation,1969
5. Authors comments on reviews;Adams;Investigative Radiol,1969