E. Antman, et al., “The TIMI Risk Score for Unstable Angina/Non-St Elevation MI—A Method for Prognostication and Herapeutic Decision Making,” Journal of American Medical Association—JAMA, Vol. 284, No. 7, 2000, pp. 835-842.
 E. Boersma, et al., “Predictors of Outcome in Patients with Acute Coronary Syndromes without Persistent ST-Segment Elevation; Results from an International Trial of 9461 Patients,” Circulation, American Heart Association—AHA, Vol. 101, 2000, pp. 2557-2657.
 E. Tang, C. Wong and P. Herbinson, “Global Registry of Acute Coronary Events (GRACE) Hospital Discharge Risk Scores Accurately Predicts Long Term Mortality Post-Acute Coronary Syndrome,” American Heart Journal, Vol. 153, No. 1, 2007, pp. 30-35.
 G. Samsa, G. Hu and M. Root, “Combining Information from Multiple Data Sources to Create Multivariable Risk Models: Illustration and Preliminary Assessment of a New Method,” Journal of Biomedical Biotechnology, Vol. 2, 2005, pp. 113-123.
 P. Gonçalves, et al., “TIMI, Pursuit and Grace Risk Scores: Sustained Prognostic Value and Interaction with Revascularization in NSTE-ACS,” European Heart Journal, Vol. 26, 2005, pp. 865-872. http://dx.doi.org/10.1093/eurheartj/ehi187
 S. Paredes, T. Rocha, P. de Carvalho, J. Henriques, J. Morais, J. Ferreira and M. Mendes, “Cardiovascular Event Risk Assessment—Fusion of Individual Risk Assessment Tools Applied to the Portuguese Population,” Proceedings of the 15th International Conference on Information Fusion, 2012, pp. 925-932.
 S. Paredes, T. Rocha, P. de Carvalho, J. Henriques, J. Morais, J. Ferreira and M. Mendes, “Improvement of CVD Risk Assessment Tools’ Performance through Innovative Patients’ Grouping Strategies,” Proceedings of the 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2012.
 “Heart Rate Variability. Standards of Measurement, Physiological Interpretation and Clinical Use. Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology,” European Heart Journal, Vol. 17, 1996, pp. 354-381. http://dx.doi.org/10.1093/oxfordjournals.eurheartj.a014868
 A. Kemp, et al., “Depression, Comorbid Anxiety Disorders, and Heart Rate Variability in Physically Healthy, Unmedicated Patients: Implications for Cardiovascular Risk,” PLoS One, Vol. 7, No. 2, 2012. http://dx.doi.org/10.1371/journal.pone.0030777
 M. Pagani, et al., “Power Spectral Analysis of Heart Rate and Arterial Pressure Variabilities as a Marker of Sympatho-Vagal Interaction in Man and Conscious Dog,” Circulation, Vol. 59, 1986, pp. 178-193. http://dx.doi.org/10.1161/01.RES.59.2.178
 J. Bigger, et al., “Frequency Domain Measures of Heart Period Variability to Assess Risk Late after Myocardial Infarction,” Journal of the American College of Cardiology, Vol. 21, 1993, pp. 729-736. http://dx.doi.org/10.1016/0735-1097(93)90106-B