1. Isolated U wave negativity;Palmer, J.H.;Circulation,1953
2. The U wave of the electrocardiogram;Lepeschkin, E.;Mod Concepts Cardiovasc Dis
3. Resting U wave inversion as a marker of stenosis of the left anterior descending coronary artery. AmJMed 1980; 69: 545-50;Gerson, M.C.; McHenry, P.L.;Am J7 Cardiol; Negative U wave: a highly specific but poorly understood sign of heart disease,1982
4. U wave inversion during attacks of variant angina;Miwa, K.; Murakami, T.; Kambara, H.; Kawai, C.;Br Heart J,1983
5. Transient U wave inversion during variant angina;Am HeartJ,1984