URBONAVIČIENĖ, G. et al. Usefulness of Signal-averaged ECG, Short-term Heart Rate Variability, QT Interval and T Loop Criteria in Predicting 2 Years Lethal Outcome after Myocardial Infarction. Elektronika ir Elektrotechnika, v. 70, n. 6, p. 29–32, 22 Jul.2006.