1. Bayly, E. J. (1968): ‘Spectral analysis of pulse frequency modulation in the nervous system’,IEEE Trans.,BME-15, pp. 257–265
2. Berger, R. D., Akselrod, S., Gordon, D., andCohen, R. J. (1986): ‘An efficient algorithm for spectral analysis of heart rate variability’,IEEE Trans.,BME-33, pp. 900–904
3. Camm, A. J., Malik, M., Bigger, J. T., Breithardt, G., Cerutti, S., Cohen, R. J., Coumel, P., Fallen, E. L., Kennedy, H. L., Kleiger, R. E., Lombardi, F., Malliani, A., Moss, A. J., Rottman, J. N., Schmidt, G., Schwartz, P. J., andSinger, D. H. (1996): ‘Heart rate variability—standards of measurement, physiological interpretation, and clinical use’,Circulation,93, pp. 1043–1065
4. DeBoer, R. W., Karemaker, J. M., andStrackee, J. (1984): ‘Comparing spectra of a series of point events particularly for heart rate variability data’,IEEE Trans.,BME-31, pp. 384–387
5. DeBoer, R. W., Karemaker, J. M., andStrackee, J. (1985): ‘Spectrum of a series of point events, generated by the integral pulse frequency modulation model’,Med. Biol. Eng. Comput.,23, pp. 138–142