Value of the 12-lead electrocardiogram in discriminating atrioventricular nodal reciprocating tachycardia from circus movement atrioventricular tachycardia utilizing a retrograde accessory pathway. - Kay,G.N.; Pressley,J.C.; Packer,D.L.; Pritchett,E.L.; German,L.D.; Gilbert,M.R. (Am J Cardiol, 1987)