J. Allen, ”Photoplethysmography and its application in clinical physiological
measurement,” Physiological Measurement, vol. 28, pp. R1–R39, Feb 20 2007.
 S. Dash, K. H. Chon, S. Lu, and E. A. Raeder, “Automatic real time detection of atrial fibrillation,” Annals of Biomedical Engineering, vol. 37, no. 9, pp. 1701–1709, 2009.
 Sheng-Chieh Huang . et.aL, ”A ±6ms-Accuracy, 0. 68mm2, and 2.21 J.lW QRS Detection ASIC”, VLSI Design, Hindawi Publishing Corporation, Volume 2012, Article ID 809393, 13 pages, 2012.
 Allen, John. ”Photoplethysmography and its application in clinical physiological measurement.” Physiological Measurement 28.3.R1-R39, (2007).
 Esenaliev, Rinat O., et al. ”Continuous, noninvasive monitoring of total hemoglobin concentration by an optoacoustic technique.” Applied Optics 43.17. págs. 3401-3407, (2004).
 Allen, J., and A. Murray. ”Variability of photoplethysmography peripheral pulsemeasurements at the ears, thumbs and toes.” IEEE Proceedings - Science Measurement and Technology 147.6.403 – 407, (2000).。
 Sait, M. L., A.W. Wood, and H.A. Sadafi, “A study of heart rate and heart rate
variability in human subjects expose to occupational levels of 50Hz circular polarised
magnetic fields,” Medical Engineering & Physics, 21: 361-369,1999.
 Kleiger RE, Miller JP, Bigger JT, et al. Decreased heart rate variability and its
association with increased mortality after acute myocardial infarction. Am J
 Malik M, Farrell T, Cripps T, et al. Heart rate variability in relation to prognosis
after myocardial infarction: selection of optimal processing techniques. Eur
Heart J 1989;10:1060-74.
 Bigger JT, Fleiss JL, Steinman RC, et al. Frequency domain measures of heart
period variability and mortality after myocardial infarction. Circulation
 Politano L, Palladino A, Nigro G, Scutifero M, Cozza V.(2008) Usefulness of heart
rate variability as a predictor of sudden cardiac death in muscular
dystrophies.Acta Myol 27:114-22.
 Lown B, Verrier RL. Neural activity and ventricular fibrillation. N Engl J Med
 Corr PB, Yamada KA, Witkowski FX. Mechanisms controlling cardiac
autonomic function and their relation to arrhythmogenesis. In: Fozzard HA,
Haber E, Jennings RB, et al., editors. The heart and cardiovascular system. New
 Schwartz PJ, Priori SG. Sympathetic nervous system and cardiac arrhythmias.
In: Zipes DP, Jalife J, editors. Cardiac electrophysiology: From cell to bedside.
Philadelphia: WB Saunders Co 1990. p. 330-43.
 Odemeyiwa O,Malik M,Farrell T,Bashir Y,Poloniecki J,Camm J. Comparison of the predictive characteristics of heart rate variability index and left ventricular ejection fraction for all-cause mortality, arrhythmic events and sudden death after acute myocardial infraction. Am J Cardiol 1988;61:208-15.
 B. Aysin, J. Colombo, and E. Aysin, “Comparison of HRV analysis methods during Orthostatic Challenge: HRV with respiration or without?,”in Engineering in Medicine and Biology Society, 2007. EMBS 007. 29th Annual International Conference of the IEEE, pp. 5047–5050, IEEE, 2007.
 C. Karmakar, A. Khandoker, H. Jelinek, and M. Palaniswami, “Risk
stratification of cardiac autonomic neuropathy based on multi-lag toneentropy,”
Med. Biol. Eng. Comput., vol. 51, p. 537?546, 2013.
 K. Nasim, A. Jahan, and S. Syed, “Heart rate variability : a review,”
J. Basic Appl. Sci., pp. 71–77, 2011.
 Akselrod, S., D. Gordon, F.A. Ubel, D. C., Shannon, A. C., Barger, and R.J., Cohen,
“Power Spectrum Analysis of Heart Rate Fluctuation: A Quantitative Probe of Beat–
to-Beat Cardiovascular Control,” Science, 213: 220-222, July 1981.
 Salinger, J., J.,Pumprla, R.,Vychodil, P.,Steskal, J.Opavsky, and J.,Novotny,
“ Microcomputer System for Telemetric Assessment of Short Term Heart Rate
Variability and Frequency Domain, Type VariaCardio TF4,” IEEE Computers in
Cardiology, 26: 599-602, 1999
 Ventura, A.G., and S. Reisman, “A Study of Factor Affecting Cardiovascular
Reactivity,” IEEE Trans. Biomed. Eng., 26: 53-54, 2000.
 Fan, S.Z., Y.J., Cheng, and C.C., Liu, “Heart Rate Variability --A Useful Non-invasive
Tool in Anesthesia,” ACTA ANAESTHESIOL SIN, 32: 51-56,1994.